7y + 18 = 39
Therefore, 7y = 39 - 18 = 21
y = 21/7
y = 3
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-8x-6y=-18
If you mean: x+7y = 39 and 3x-2y = 2 Then by substitution: x = 4 and y = 5
x + 7y = 39 So x = 39 - 7y Substitute for x in the second equation: 3(39 - 7y) - 2y = 2 117 - 21y - 2y = 2 115 = 23y y = 5 Substitute this value for y back into the first equation: x + 7*5 = 39 x + 35 = 39 x = 4
(9,6)
y2+7y=18 y2+7y-18=0 (y+9)(y-2)=0 y=-9 & y=2