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Coolmath Algebra
Solving Equations Lesson 3 - What to Do - Part 2   (page 2 of 5)
---- This algebra lesson explains how to solve an equation by multiplying or dividing both sides of an equation by a number.

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Now available: Coolmath Algebra books! Part 1, Part 2 and Part 3 covering the Algebra you need from Algebra 1 through Precalculus Algebra (Beginning Algebra through College Algebra)

other Coolmath Books: Coolmath Precalculus Review (the math you really need to survive Calculus 1) and Math Survival Guide (How to conquer math and deal with math anxiety)
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Here's one that's not so obvious:
Solve        3x = 7

(Harder to guess the answer now, huh?)

Get the x alone...  Who's bugging him?  The 3!

Since the 3 is multiplied with the x, we'll undo him by dividing both sides by 3:

3x / 3 = 7 / 3 So, x = 7/3
 

Hey -- Did you know that you can check these things?

We started with 3x = 7... and got x = 7/3... Put it back in! 3x = 7... 3(7/3) = 7 which gives 7 = 7 Yep, it works!

TRY IT:

Solve          5x = 13          *And check it!

Continued on the next page

 The printing and distribution and/or downloading of these lessons is strictly prohibited.
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