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m = -a / b
m = -1 / -3 = 1/3
m = 1/3 dan melalui (-2,5)
y-y1 = m (x-x1)
y - 5 = 1/3 ( x + 2 )
3(y-5) = 1(x+2) # 3 nya pindah ke sebelah kiri menjadi perkalian.
3y - 15 = x + 2
0 = x-3y +15 + 2
0 = x - 3y + 17 atau x - 3y + 17 = 0