2p - q =5 P+3q = -1 Tentukan persamaan dua variabel

2p - q = 5 |×1
p + 3q = - 1 |×2

2p - q = 5
2p + 6q = - 3
--------------------(-)
- 7q = 8
q = 8/7

2p - q = 5
2p - 8/7 = 5
2p = 5 + 8/7
2p = 43/7
p = 43/14

2p - q = 5. 2p-2p=0. 5-(-2)=7
2p - 6q = -2. -q-6q=-7q
-7q=7
q=-1
2p - (-1) = 5
2p + 1 = 5
2p = 5 - 1
2p = 4
p = 4/2
p 2

q = -1 p = 2