Tentukan HPnya (metode eliminasi)

1).
eliminasi x
3x + 2y = 21
3x – 3y = 6
_________-
5y = 15
y = 15/5
y = 3

eliminasi y
3x + 2y = 21 (×3)
3x – 3y = 6 (×2)

9x + 6y = 63
6x – 6y = 12
________+
15x = 75
x = 75/15
x = 5

Hp nya adalah {5,3}

2).
eliminasi x
2x – 3y = -18 (×2)
4x + 5y = 8 (×1)

4x – 6y = -36
4x + 5y = 8
_________-
-11y = -44
y = -44/-11
y = 4

eliminasi y
2x – 3y = -18 (×5)
4x + 5y = 8 (×3)

10x – 15y = -90
12x + 15y = 24
__________+
22x = -66
x = -66/22
x = -3

Hp nya adalah { -3, 4 }