9p = 8q - 12
9p = 2(4q) - 12
9p = 2(3q) - 12
9p = 6p - 12
3p = -12
p = -4
3 × −44= 4q4\;\frac{3\;\times\;-4}{4} = \;\frac{4q}{4}43×−4=44q
q = 13
pq = -3 x -4
= 12
