Question

Tolong ya!!! ni 1-5 ,tentukan nilai x dan y menggunakan metode gabungan.

Answer 1

1) y - 3x = -3
y + x = 1
----------------(-)
-4x = -4
x = 1
x + y = 1
y = 1 - 1 = 0

2)3x - 2y = 4|×2|6x - 4y = 8
6x + 5y = 17|×1|6x + 5y = 17
---------------------------------(-)
-9y = -9
y = 1
3x = 2y + 4
3x = 2.1 + 4 = 6
x = 6 ÷ 3 = 2

3) 5x + y = 6|×2|10x + 2y = 12
3x + 2y = -2|×1|3x + 2y = -2
-----------------------------------(-)
7x = 14
x = 2
5x + y = 6
5.2 + y = 6
y = 6 - 10 = -4

4) 5x - 3y = 7|×2|10x - 6y = 14
2x + 5y = 3|×5|10x + 25y = 15
------------------------------------(-)
- 31y = - 1
y = 1/31
2x + 5y = 3
2x + 5.1/31 = 3
2x + 5/31 = 3
2x = 3 - 5/31
2x = 93/31 - 5/31 = 85/31
x = 85/31 ÷ 2
x = 85/31 × 1/2 = 85/62
x = 1 23/62

5)3x + ay = 4
2x + ay = 2
---------------(-)
x = 2
2x + ay = 2
2.2 + ay = 2
ay = 2 - 4 = -2