Example Question:

x= y-7

-y=2x=8

Example to solve substituting equations to solve..

substitute 1st equation into the 2nd one

-y = 2*(y-7) - 8

-y = 2y - 14 - 8

-y = 2y - 22

-y - 2y = -22

-3y = -22

y= 22/3

substitute the value of y in the 1st equation to get x.

## Sunday, February 7, 2010

### Substituting equations to solve.

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