Ava45018
Ava45018
29-12-2017
Mathematics
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choixongdong
choixongdong
29-12-2017
x = 1
y = -4
xy = (1)(-4) = -4
answer
C) -4
double check:
y - 4 = 4x + 3y = -(9-x)
-4 - 4 = 4(1) + 3(-4) = -(9 - 1)
- 8 = -8 = -8
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