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a = 6 dan b = 3
gradien (m) tegak lurus
= b/a
= 3/6
= 1/2
maka,
pers.grs.melalui ttk.(4,-1) dan m = 1/2 :
y-y1 = m(x-x1)
y-(-1) = 1/2 (x-4)
y+1 = 1/2 (x-4)
kedua ruas dikalikan dg 2, menjadi :
2(y+1) = 1(x-4)
2y+2 = x-4
x-2y-4-2 = 0
x-2y-6 = 0
atau
x-2y = 6