Question

I need help on answering my math homework question

Answer 1

p+q=4

4p+q=1

p = 4-q

4(4-q)+q=1

16-4q + q = 1

-3q=1-16

-3q=-15

q=-15/-3 = 5

q=5

p+5=4

p=4-5

p=-1