tolong jawab no 7,8,9 pakai cara tolong banget kak

7.
3x - 2y + 5 = 0
2y = 3x + 5
y = 3/2x + 5/2

m1 = 3/2

m1m2 = -1
3/2 m2 = -1
m2 = -2/3

Jawab C

8.
a.
3x - y + 5 = 0
3 . 2 - 3 + 5 = 8 Salah

b.
3y - 2x + 5 = 0
3y = 2x - 5
y = 2/3 x - 5/3
gradien = 2/3 benar

Jawab B

9.
2x - 5y = -16 dikali 3
3x + 2y = -5 dikali 2

6x - 15y = -48
6x + 4y = -10
-------------------- -
-19y = -38
y = 2

2x - 5.2 = -16
2x = -6
x = -3

2 .(-3)/3 + 1/2 . 2 = -2 + 1 = -1

Jawab C