no 19 tolong ya kak dengan cara

jawab
19)

titik potong
4x + 5y = 17 ........kali 3
- 3x + 2y = - 30.....kali 4

12x + 15 y = 51
-12x + 8y = -120 ....(+)
23y = -69
y = - 3

4x + 5y = 17
4x + 5(-3) = 17
4x = 17 + 15 = 32
x = 8

titik A(x, y) = (8, -3)
garis g melalui A dengan gradien = -1/4
y - y1 = m( x- x1)
y + 3 = -1/4 (x - 8
4(y +3) = -(x - 8)
4y +12 = -x + 8
x + 4y = - 4