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m7 system of equations/substitution
Contributed by: Childress
x= 4
3x+ 5y = -8
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y= -3
6x + 5y = 9
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y= 5x
-3x + y = 18
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x= 2y+5
2x - 3y = 8
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y= 7x + 8
y= 5x - 14
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x + y = 10
5x + y = 22
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hint: solve 1 of them for y
3x + y = -7
x + 2y =16
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y= 8x + 12
y=2x 
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x= y + 4
5x - y = -4
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-3x + 2y = 16
-2x + y = 9
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