tolong yah. pleaseeee

4x - 3y = 15 |dikali 5
5x - 4y = 19 |dikali 4

20x - 15y = 75
20x - 16y = 76
y = -1

4x - 3y = 15
4x - 3(-1) = 15
4x = 15 -3
4x = 12
x = 3