You have 2 equations and 2 unknowns. You can solve by many methods, lets try substitution method.
p=2q+3 <-- eqn 1
p+q = 9 <-- eqn 2
plug eqn 1 into eqn 2:
2q + 3 + q = 9
simplify:
3q=6
q=6/3 = 2
Now you have q=2 , you can plug that value into eqn 1 or 2 to find the value of p
p = 2q+3
p+q = 9
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