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a = -2 dan b = 3
gradien tegak lurus :
m = b/a = 3/-2 = - 2/3
maka,
pers.grs.melalui ttk.(-1,3) dan m = - 2/3 :
y-y1 = m(x-x1)
y-3 = - 2/3 (x-(-1))
y-3 = - 2/3 (x+1)
kedua ruas dikali dg 3, menjadi :
3(y-3) = -2(x+1)
3y-9 = -2x-2
2x+3y-9+2 = 0
2x+3y-7 = 0
atau
2x+3y = 7