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a = 5 dan b = -2
gradien tegak lurus :
m = b/a = -2/4 = -1/2
maka,
pers.grs.melalui ttk.(6,-4) dan m = -1/2 :
y-y1 = m(x-x1)
y-(-4) = -1/2 (x-6)
y+4 = -1/2 (x-6)
kedua ruas dikali dg 2, menjadi :
2(y+4) = -1(x-6)
2y+8 = -x+6
x+2y+8-6 = 0
x+2y+2 = 0
atau
x+2y = -2