Tolong bantu ya no 10
Jawaban Terkonfirmasi
4x – 3y + 8 = 0 ⇒ a = 4 ; b = – 3
m1 = – a/b
= – 4 / -3
= 4/3
syarat ⊥ ⇒ m1 x m2 = – 1
4/3 x m2 = – 1
m2 = – 3/4
melalui (2 , – 7)
y – y1 = m2 (x – x1)
y – (- 7) = – 3/4 (x – 2)
y + 7 = – 3/4 (x – 2) …. kalikan dengan 4
4y + 28 = – 3(x – 2)
4y + 28 = – 3x + 6
3x + 4y = 6 – 28
3x + 4y = – 22 ,,,,, jawaban : b
-3y = -4x – 8
y = 4/3x + 8
gradien = 4/3
gradien tegak lurus = – 1 : 4/3 = – 3/4
persamaan = 3x + 4y = -22