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y-x + 2 = 0
a - 2 + 2 = 0
a = 0
PG yang melalui (2,0) dan (-1,2) adalah
(y-y1) / (y2 - y1) = (x-x1) / (x2-x1)
(y - 0) / (2-0) = (x - 2) / (-1 -2)
y / 2 = (x-2) / -3
-3y = 2x - 4
0 = 2x + 3y - 4
2. 2x + y= 12
2 . 3 + y = 12
6 + y = 12
y = 6