Question

P + 2q = 11
2p + q = 10​

Answer 1

p = 3

q = 4

Explanation:

p + 2q = 11 --------------------(I)

p = 11 - 2q

2p + q = 10 --------------------(II)

Substitute p = 11 -2q in equation (II)

2(11 - 2q) + q =10

2*11 - 2q *2 + q = 10

22 - 4q + q = 10

22 - 3q = 10

-3q = 10 - 22

-3q = -12

q = -12/-3

q = 4

Plugin q = 4 in equation (I)

p + 2q = 11

p + 2*4 = 11

p + 8 = 11

p = 11 - 8

p = 3