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m1 x m2 = -1
m2 dari garis 4x-3y+8=0 adalah
m2 = -(4)/(-3) = 4/3
m1 x m2 = -1
m1 x 4/3 = -1
m1 = -3/4
persamaan garisnya
y -y1= m1(x-x1)
y-(-7) =-3/4 (x-2)
4(y+7) = -3(x-2)
4y+28 = -3x +6
3x +4y +22=0