Tolong bantuannya nomer 4 dan 5, sekaligus di kasih caranya

4) eliminasi y
4x + y = 9 |×4
x + 4y = 6 |
16x + 4y = 36
x + 4y = 6
__________-
15x = 30
x = 2
substitusi x = 2 ke x + 4y = 6
(2) + 4y = 6
4y = 6 -2
4y = 4
y = 1
Hp (2, 1)
nilai 2x + 3y = 2(2) + 3(1) = 4 + 3 = 7

5) sejajar x + 4y - 2 = 0
m = -¼ melalui (8, -3)
y + 3 = -¼(x - 8)
y + 3 = -¼x + 2
y = -¼x - 1
semua kali 4
4y = -x - 4
4y + x + 4 = 0