diketahui garis g dengan persamaan 4x – 3y = 9.persamaan garis yg tegak lurus terhadap garis g dan melalui titik (-8, -1) adalah…A. 4x + 3y = 28 .B. 4x – 3y = 28 .C. 4y + 3x = -28 D.4y – 3x = -28
4x – 3y = 9
4x – 9 = 3y
4/3 x – 9 = y
m1 = 4/3
m2 = -3/4
..
titik (-8 , -1)
m2 = -3/4
y-y1=m(x-x1)
y+1 = -3/4 (x + 8)
y+1 = -3/4x -6
(kalikan 4)
4y + 4 = -3x -24
3x + 4y = -24 -4
3x + 4y = -28 ( c )