SOLUTION: solve by the substitution method 9x+4y= -24 x=20-8y

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Question 277132: solve by the substitution method
9x+4y= -24
x=20-8y
Answer by CharlesG2(834) About Me  (Show Source):
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solve by the substitution method
9x+4y= -24
x=20-8y
9 * (20 - 8y) + 4y = -24 (plugged 2nd into first)
180 - 72y + 4y = -24
180 - 68y = -24
-68y = -204
68y = 204
y = 3
x = 20 - 8(3)
x = 20 - 24 = -4