SOLUTION: Solve using any method 8x+9y=-21 -8x+y=51 the solution set is????? PLEASE HELP

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Question 941173: Solve using any method
8x+9y=-21
-8x+y=51
the solution set is?????
PLEASE HELP
Answer by richard1234(7193) About Me  (Show Source):
You can put this solution on YOUR website!
A simple way is to add the two equations:

10y = 30
y = 3

Substitute into either equation to get x = -6.

Solution set: {(-6,3)}