subtitusikanlah 2x-y=18 dan 3x+4y=5 tolong dijawabyah saya butuh bantuan!

2x - y = 18
- y = - 2x + 18
y = 2x - 18

subtitusi
3x + 4y = 5
3x + 4(2x - 18 ) = 5
3x + 8x - 72 = 5
11x = 5 + 72
11x = 77
x = 7

subtitusi
y = 2x - 18
y = 2(7) - 18
y = 14 - 18
y = - 4

hp = ( 7, -4 )