Lesson 5:  Solved Examples
Another equation we aim to solve:
What is the number that �x� stands for?

We want something like
With �x� on the left and a number on the right.

Let�s start by making the 9 disappear. To do this we must subtract 9 from BOTH sides of the equation.
On the left side: 9 � 9 equals zero

On the right side: 4 � 9 equals -5


We now have
Next step: 5/2 must go!

Well, 5/2 is multiplied by �x� so we must divide by the same number 5/2. Or we can multiply by the opposite fraction 2/5. It�s easier.

Let�s do it on
BOTH sides.
On the left side: 2/5 times 5/2 is equal to 1. Because the �1x� is the same as only �x� we got the �x� alone on the left side.

On the right side: -5 times 2/5 is equal to -2


So the final answer is
Which is true if we try to use -2 instead of �x� in the starting equation.

Congratulations!


The equation is solved !

In rapid motion...
solve2
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Bye for now. More solved examples in a few days.
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