douglas12
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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jim_thompson5910
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y = 2x + 7
3x+8 = 2x + 7 ... replace y with 3x+8 (since y = 3x+8)
3x2x = 78
x = ???

douglas12
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1

jim_thompson5910
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if x = 1, then
y = 3x + 8
y = 3*(1) + 8
y = ??

douglas12
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5

jim_thompson5910
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correct, so (x,y) = (1, 5)