x=2y+7 disubstitusikan 3x-2y=3

x = 2y+7
3x-2y = 3
3(2y+7) - 2y = 3
6y+21-2y = 3
4y+21 = 3
4y = -18
y = -4,5

3 (2y+7) - 2y = 3
6y+21-2y =3
4y = 3-21
4y = -18
y = -18/4 = -9/2

x = 2.-9/2 + 7
= -9 + 7 = -2


maaf kl salah