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-3x - 4y = { -3(2) - 4(-7) }
-3x - 4y = -6 + 28
-3x - 4y = 22
jadi persamaan garis lulus nya -3x - 4y = 22
Maka 3y = 4x-8
y= 4/3x - 8/3 maka m1 = 4/3 (didepan x)
Syarat tegak lurus --> m1.m2 = -1
Maka 4/3.m2 = -1
m2 = -1/ 4/3 atau -1 x 3/4 = -3/4
Melalu titik (2,-7)
y-y1 = m(x-x1)
y-(-7) = -3/4(x-2)
y+7 = -3/4x+ 3/2
3/4x - 3/2 + y + 7 = 0
3/4x + y + 11/2 = 0 semua ruas dikali 2
3/2x + 2y + 11 = 0 ;)