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OpenStudy (anonymous):
Solve the system by the method of substitution. y = 3x + 8 y = 2x + 7 A. (1, 9) B. (–1, 5) C. (1, 11) D. (11, 1)
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jimthompson5910 (jim_thompson5910):
y = 2x + 7 3x+8 = 2x + 7 ... replace y with 3x+8 (since y = 3x+8) 3x-2x = 7-8 x = ???
OpenStudy (anonymous):
-1
jimthompson5910 (jim_thompson5910):
if x = -1, then y = 3x + 8 y = 3*(-1) + 8 y = ??
OpenStudy (anonymous):
5
jimthompson5910 (jim_thompson5910):
correct, so (x,y) = (-1, 5)
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