System of substitution
Y-9=-x
3x-y=7
2 answers:
1. X = 9 - Y
2. X = 7+y/3
I really hope this helps. :)
3(y-9)-y=7
3y - 27 -y = 7
2y = 34
Y = 17
3(x) -17 = 7
3x = 24
X = 8
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