-2y = 10 2y = -10 y = -5
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2y+5y=10 7y=10 y=10/7
-2x - 2y = -122x + 2y = 122y = 12 - 2xy = 6 - x
4y = 2y + 40 4y - 2y = 2y -2y +40 2y = 40 y = 20 check 4(20) = 2(20) +40 80 = 80
y = 5
2Y + 10 = 28 subtract 10 from both sides 2Y + 10 - 10 = 28 - 10 2Y = 18 divide both sides by 2 Y = 9 -------- check 2(9) + 10 = 28 18 + 10 = 28 28 = 28 checks