Question

elimination 3x-2y=11 3x-y=7

Answer 1

3x - 2y = 11
3x - y = 7 ---->(-1)
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3x - 2y = 11
-3x + y = -7 (result of multiplying by -1)
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-y = 4 -- multiply by -1 to make y positive
y = -4
now sub -4 in for y in either equation to find x
3x - 2y = 11
3x - 2(-4) = 11
3x + 8 = 11
3x = 11 - 8
3x = 3
x = 1
check...
3x - y = 7
3(1) - (-4) = 7
3 + 4 = 7
7 = 7 (correct)

x = 1 and y = -4
any questions ?