1) eliminasi y x - y = 3. |×3. 2x + 3y = 1 |×1 3x - 3y = 9 2x + 3y = 1 _________+ 5x = 10 x = 10/5 x = 2 Substitusi x = 2 ke persamaan x - y = 3 (2) - y = 3 y = 2 - 3 y = -1
HP (2, -1)
2) eliminasi y 5x - 2y = 3 |×1 -x - y = 5 |×2 5x - 2y = 3 -2x - 2y = 10 __________- 7x = -7 x = -1 Substitusi x = -1 ke persamaan -x - y = 5 -(-1) - y = 5 y = 1 - 5 y = -4 HP(-1, -4)
Verified answer
1) eliminasi yx - y = 3. |×3.
2x + 3y = 1 |×1
3x - 3y = 9
2x + 3y = 1
_________+
5x = 10
x = 10/5
x = 2
Substitusi x = 2 ke persamaan x - y = 3
(2) - y = 3
y = 2 - 3
y = -1
HP (2, -1)
2) eliminasi y
5x - 2y = 3 |×1
-x - y = 5 |×2
5x - 2y = 3
-2x - 2y = 10
__________-
7x = -7
x = -1
Substitusi x = -1 ke persamaan -x - y = 5
-(-1) - y = 5
y = 1 - 5
y = -4
HP(-1, -4)