2X + 7 = 5X + 16
subtract 2X from both sides
7 = 3X + 16 subtract 16 from both sides
-9 = 3X
divide both sides by 3
-3 = X
check
2(-3) + 7 = 5(-3) + 16
1 = 1
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2x + 5y = 16 -2x - 3y = -14 2y = 2 y = 1 / x = 5.5 (5.5,1) or (5 1/2,1)
-2x+16 = 0 -2x = -16 x = 8
-5x+3(x+8)=16-2x
x = -5
8x + 16 = 6x -> 2x + 16 = 0 -> 2x = -16 -> x = -8