Posted by **micheal** on Tuesday, June 16, 2009 at 12:20am.

Solve by substitution method

9x+6y=21-9x+y=35

What is the solution of the method?

- math -
**drwls**, Tuesday, June 16, 2009 at 5:23am
Those are two separate equations. You should have typed:

9x + 6y = 21

-9x + y = 35

You can either add them, or SUBSTITUTE y-35 for 9y in the first equation. Either way, you get

7y = 56

y = 8

9x + 48 = 21

x = -3

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