tlong dong no 3 dan 4 pake cara

3) eliminasi x
2x - 4y = 6
2x - 2y = 4
________-
-2y = 2
y = -1
substitusi nilai y = -1 ke persamaan 2x - 2y = 4
2x - 2(-1) = 4
2x = 4 - 2
2x = 2
x = 1
HP (1, -1)

4) eliminasi x
5x + 2y = 34 |×2
2x - 5y = 2 |×5
10x + 4y = 68
10x - 25y = 10
___________-
29y = 58
y = 2
nilai y = 2
jika ditanyakan nilai x substitusi y = 2 ke persamaan 2x - 5y = 2
2x - 5(2) = 2
2x = 2 + 10
x = 12/ 2
x = 6
HP (6, 2)