4p+3q=9 and 2p+3q=3

Answer 1

4 p + 3 q = 9
-
2 p + 3 q = 3
__________
4 p - 2 p + 3 q - 3 q = 9 - 3

2 p = 6

Divide both sides by 2

p = 3

Put this value in equation:

4 p + 3 q = 9

4 ∙ 3 + 3 q = 9

12 + 3 q = 9

Subtract 12 to both sides

3 q = - 3

Divide both sides by 3

q = - 1