tolong di bantuin kakak pakek cara subtitusi yang c dan d tolongg ya besok kumpul

C) 3x + 3 = 3y
2x - 6y = 2.
= 3x -3y = -3 → x2
2x - 6y = 2 → x3
= 6x -6y = -6
6x -18y = 6
_________ _
12y = -12
y = -1

D) 5x = 4y + 8
3y = 3x - 3
= 4y - 5x = -8 → x3
-3y + 3x = 3 → x4
= 12y - 15x = -24
-12y + 12x = 12
___________ +
-3x = -12
x = 4

Maaf klo salah