Tolong jawab yaa,makasih sebelumnya

Tolong jawab yaa,makasih sebelumnya

$frac{1}{2} x + y = 2 frac{1}{2} \ x + 2y = 5 \$
3x – 4y = -5 |×2|
x + 2y = 5 |×4|

6x – 8y = -10
4x + 8y = 20
__________ +
10x = 10
x = 10 : 10
x = 1

x + 2y = 5
1 + 2y = 5
2y = 5 – 1
2y = 4
y = 4 : 2
y = 2

p + q = 1 + 2 = 3

Jawab. A.