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→ 2x-y+5=0
m1=-a/b
m1=-2/-1
m1=2
Tegak lurus → m1m2=-1
m1m2=-1
2m2=-1
m2=-½
m=-½
melalui titik potong A (1,-5)
y-y1=m(x-x1)
y+5=-½(x-1)
y+5=-½x+½
y=-½x+½-5
y=-½x-9/2
atau
2y=-x-9
atau
x+2y+9=0
Silakan dicek lagi.