SOLUTION: Ok so here is my problem so far: (substitution) y=2x+7 3x-y=-9 When you put the y in to substitute should it be like this: 3x-(2x+7)=-9 Would you distribute? Or just totally f

Question 808472: Ok so here is my problem so far: (substitution)
y=2x+7
3x-y=-9
When you put the y in to substitute should it be like this:
3x-(2x+7)=-9
Would you distribute? Or just totally forget the negative and write it like this:
3x+2x+7=-9
Answer by stanbon(75887) (Show Source): You can put this solution on YOUR website!
so far: (substitution)
y=2x+7
3x-y=-9
When you put the y in to substitute should it be like this:
3x-(2x+7)=-9
Would you distribute?
------
Yes:: distribute
=======================
3x-2x-7 = -9
-----
x = -2
--------
Solve for "y":
y = 2x+7
y = -4+7
y = 3
====================
Cheers,
Stan H.
====================
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