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y = -2x+1
m1 = -2
Tegak lurus, maka:
m1.m2 = -1
-2.m2 = -1
m2 = 1/2
y-y1 = m.(x-x1)
y-3 = 1/2.(x-(-2))
y-3 = 1/2x+1
y = 1/2x+1+3
y = 1/2x+4 (kali 2 kedua ruas)
2y = x+8
0 = x-2y+8