SOLUTION: Substitution method: 7x - y = 24 x = 2y + 9

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Question 307544: Substitution method:
7x - y = 24
x = 2y + 9
Answer by checkley77(12844) About Me  (Show Source):
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7x - y = 24
x = 2y + 9
7(2Y+9)-Y=24
14Y+63-Y=24
13Y=24-63
13Y=-39
Y=-39/13
Y=-3 ANS.
X=2*-3+9
X=-6+9
X=3 ANS.
PROOF:
7*3-(-3)=24
21+3=24
24=24