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Anonymous
5y+14+y = 3y-7
5y+y-3y = -7-14
3y = -21
y = -7
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y = 14
2x + 5y = 16 -2x - 3y = -14 2y = 2 y = 1 / x = 5.5 (5.5,1) or (5 1/2,1)
(9,3)
(-5, 2)
The Commutative Property of Addition.