Posted by **Bre** on Friday, January 20, 2012 at 4:37pm.

Solve by the substitution method. What is the solution of the system?

3x+9y=48

-6x+y=56

- math -
**Steve**, Friday, January 20, 2012 at 11:51pm
To use the substitution method, you solve one equation for x, and then substitute that expression for x in the other equation. or, you can solve for y if it's easier.

3x + 9y = 48

3x = 48 - 97

x = 16 - 3y

-6x + y = 56

-6(16-3y) + y = 56

-96 + 19y = 56

19y = 152

y = 8

so,

x = 16 - 24 = -8

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