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h(5) = 5p + q = -42
h(-2) = -2p + q = 7
--------------------------- -
7p = -49
p = -7
5p + q = -42
-35 + q = -42
q = -7
h(x) = -7x -7
h(12) = -7 × 12 -7
= -84 -7 = -91