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f(2) = 2a + b = -22
f(-4) = -4a + b = 32
2a + b = -22
-4a + b = 32
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6a = -54
a = -54/6
a = -9
2a + b = -22
2(-9) + b = -22
-18 + b = -22
b = -22 + 18
b = -4