SOLUTION: for what value of x is (x,-3) a solution for 4x-3y=21?

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Question 766414: for what value of x is (x,-3) a solution for 4x-3y=21?
Answer by tommyt3rd(5050) About Me  (Show Source):
You can put this solution on YOUR website!
4x-3y=21
4x-3(3)=21
4x=21+9
4x=20
x=5

:)