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How To: Solve a system of linear equations by substitution

System of equations is nothing but a system which contains more than one linear equations. This system of equations can be solved to arrive at the solution of the system. A simple system of the linear equations can be a pair of equations. To solve this kind of system you can employ the substitution method. So take the two equation of the system. Solve for the value of y in the first equation in terms of x. Now take this value of y and substitute in the second equation y value. Now the second ...

How To: Make potassium trichromate

In this how-to video, you will learn how to make potassium trichromate. You will need potassium chromate and dichromate. It is easy to go between the two. You can add a base to the dichromate to make the chromate. It will go from orange to yellow. The trichromate can be produced. You will need nitric acid, potassium dichromate, and sodium disulphate. First, make a solution of sodium sulphate. Take a long test tube and the potassium dichromate to it. Add double the volume of concentrated nitri...

How To: Milk a cow

Modern milking parlors use machines, but milking a cow by hand is an ancient art. Here’s the "udderly" perfect way to do it.

Spice Rack Explosives: How to Make Gunpowder with Salt & Sugar

The best chemistry experiments are those you can perform with items already laying around your house. With only some sugar, salt substitute and an instant cold pack, you can make your very own gunpowder! Being able to make homemade gunpowder without a trip to the store can be a lifesaver, no matter if it's just for testing out a Civil War-era musket, blowing up stubborn tree stumps, or preparing for battle when imperialists overrun your country.

How To: Capture audio when shooting video

In this tutorial, we learn how to capture audio when shooting video. First, you will need to choose the location and survey the environment. Make sure you can control the noise outside. You will also need to close the gap between what you are recording and where the microphone is at. The closer you are to the camera, the better audio you will get. You also need to choose a great microphone for your camera. You can use a large microphone on top of your camera or have one that goes overhead and...

How To: Use hydrogen for better mileage

Hydrogen can be used to improve mileage. The hope with this method is that hydrogen will increase the amount of gasoline combusted and increase fuel efficiency, as you trickle hydrogen into the tank. Often propane is used to increase gas mileage. The studies are still being done. There's no official data at present, but there is significant experimentation.

How To: Make a PSP Pandora's Battery and MMS with PSPtool

Hacking the PSP is a complicated process, and there has been some demand for a software tool that would make the process easier. This video has that solution. It explains how to use a program called PSPtool to create the magic memory stick and Pandora's battery much more easily than you could otherwise. Follow these instructions and play those homebrews!

How To: Change your camo colors in CoD4 for Playstation 3

Have you tired of the stock camo setting that you can clothe your character with in Call of Duty 4: Modern Warfare? This video has the solution for you, at least if you play the game on the Playstation 3. It explains how to use the Sony Vegas Pro video editing software to change the colors of your in-game camo, allowing you to dress your character in a much wide variety of colors. Stand out from all the other kids at the frag party with this helpful technique!

How To: Perform the hand on body magic trick

This trick is great for anyone who is easy to fool - from little kids to drunk bar patrons. In this two part video, you will learn how to perform a super simple trick - no props needed - that will make everyone laugh. Ask a friend to touch a spot anywhere on their body with one hand that they are unable to touch with the other hand. Watch them stuggle and then check out part two of this clip to see the solution!

How To: Solve advanced ratio problems in algebra

Need to know how to solve complex ratio problems in basic algebra? From Ramanujan to calculus co-creator Gottfried Leibniz, many of the world's best and brightest mathematical minds have belonged to autodidacts. And, thanks to the Internet, it's easier than ever to follow in their footsteps (or just finish your homework or study for that next big test). With this installment from Internet pedagogical superstar Salman Khan's series of free math tutorials, you'll learn a system for finding solu...

How To: Make an erupting volcano with soap

In this video tutorial, viewers learn how to make an erupting volcano with soap. Begin by adding some vinegar into a flask/baker. Then add some soap into the vinegar and stir it by shaking the flask/baker. Users may choose to add some food coloring to make the mix look more like lava. In a separate, add some water and baking soda. Then stir it to mix. Pour the baking soda solution into the soap and vinegar mixture. This video will benefit those viewers who are interested in science and experi...

How To: Solve a system of linear equations through graphing

This video shows the method to solve a pair of linear equations by plotting their graph. Look for points of intersection of the two graphs which is the solution. Let us solve 5x-y=6 and 2x+y=8. Writing the equations of lines in slope intercept form, we get y=5x-6 and y=-2x+8. Now we plot the two lines. For the slope 5 or 5/1, we go up 5 units and left 1 units from the point of intersection on the y axis. For -2 or -2/1, we go down 2 units and left 1 units from the point of intersection on the...

How To: Make chile pods mild or hot

In this Home & Garden video tutorial you will learn how to make chilly pods mild or hot. Curtis Smith, extension horticulturist, presents this video along with Patricia Aaron. The heat of the chilly is in the skin and the veins. When you cut open a chilly, you will see all the veins are near the shoulder or the chilly. So, the shoulder part of the chilly is hotter than the tip. So, if you want to make the chilly milder, then cut off the top part. Seeds do not add to the heat of the chilly. If...

How To: Use new features for photographers in Photoshop CS5

Whether you're new to Adobe Photoshop or a seasoned digital photographer after a general overview of CS5's most vital new features, you're sure to be well served by this official video tutorial from the folks at Adobe TV. New Photoshop CS5 helps you achieve the visual and emotional effects you’re after with re-engineered features for reducing and adding grain, performing post-crop vignetting, and sharpening. CS5 reinvents HDR imaging with Exposure Merge, which makes it easy to preserve the fu...

How To: Clean vulcanized shoes

In this video, Jeff shows how to frugally clean your vulcanized shoes. You need a water bottle with a tablespoon of non-bleach detergent, a pencil with a clean eraser, an old toothbrush, a cloth and some paper towels. First, wipe the shoes clean by pouring the detergent solution onto a wash cloth and then scrubbing down the shoes. Soak up any excess water with a paper towel right away. Then, use the eraser of the pencil to help clean the dirt off of the soles of the shoes. If your shoe has te...

How To: Switch between calls on a BlackBerry

In this video Darci Larocque of Swirl Solutions is demonstrating how to quickly switch between callers on your Blackberry. Often if you are talking to a person and someone else calls, you need not hang up the call. You can simply use the Flash feature to switch between the two calls without hanging any of them. While you are on a call , you can just click on menu and you will get a flash option. This will flip you between two callers. This is a great tip for Blackberry users.

How To: Install a printer on your Mac

In this video, Gary from MacMost gives some tips on how to set up a new printer with your Mac. Some printers don't work for Macs, so make sure it's compatible before purchasing it, by checking the internet. Check if a USB cable comes with a cable and buy one if necessary. Ignore the CD that comes with the printer, because it probably doesn't have the correct Mac drivers. Leopard or Snow Leopard systems will find the correct drivers for you automatically most of the time. You might need to dow...

How To: Use non-transitive dice to cheat your friends

Need a new prank or trick to play on your friends? Well this video is your solution. All you need a non-transitive dice and to follow this video and you will be cheating your friend in no time. The idea behind this video is to use dice that are non standard, which means instead of having from 1 to 6 on the sides, they have other numbers. By playing with what numbers go on the faces, the viewers can skew with the probabilities of what number comes up. With this idea, the viewers can make dice ...

How To: Perform multiple dry ice experiments

This video shows how sublimation works. The instructor shows how to mix bubbled water, ice water and dry ice to create dry ice smoke. He is essentially making a hand made fog machine. This task must be done carefully because if the solution is isolated and concealed it will build pressure and possibly explode. Take extreme caution in doing this home experiment. The instructor also shows you how to make music spoons using temperature changes on the metal.

How To: Call voicemail with one key on your BlackBerry

In the GetConnected TV show BlackBerry expert Darci Larocque from Swirl Solutions gives an easy tip on how to call voicemail directly with one (1) key. This option can be seen in other cell phones also, but in a BlackBerry you can set a password for this. Hold the green button or call log , go to menu - Voice Mail, set your password, click escape and save. Now when you dial No.1 or hold it down you go directly to your voicemail.

How To: Hide screw holes with wood plugs

There are a number of ways to deal with screw holes that are visible. You can buy some wood buttons and put them in the holes. You put a little wood glue in the hole and then tap the wood buttons into the holes using a hammer. This is a decorative solution to cover up screw holes. If you want to completely cover up the holes completely put a plug cutter on your drill and cut a plug out of a piece of wood that matches the wood that the hole is in. Take the plug put a little glue on it and tap ...

How To: Watermark photos in Lightroom 2

Get your dose of the coolest Adobe Lightroom tutorials, tips, time-saving shortcuts, photographic inspiration, and undocumented tricks with Matt Kloskowski from Photoshop User TV. Photoshop Lightroom is the leading photo management software solution. See what leading photographers use to manage their photos, and how.