17 = 7 + 8y
Subtract 7 from both sides:
10 = 8y
Divide both sides by 8:
10/8 = y
Simplify:
y = 5/4 or y = 1.25
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If: -8y-7 = -8+8y Then: -7+8 = 8y+8y And: 16y = 1 So: y = 1/16
7
(5,3)
10*6+8*7 = 116
x + 8y = 3 therefore 2x + 16y = 6 (a) 2x + 3y = -7 (b) Subtract (b) from (a): 13y = 13 so y = 1 and x = -5