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s(x) = px+q
x=-2 ⇔ 14 = p(-2)+q ⇒ 14 = -2p+q
x=4 ⇔ -4 = p(4)+q ⇒ -4 = 4p+q -
18 = -6p
p = -3 ⇒ q=8
s(x) = px + q = -3x+8