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f(2) = 2a + b = 7
f(-1) = -a + b = -2
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3a = 9
a = 3
2a + b = 7
2 (3) + b = 7
6 + b = 7
b = 7- 6
b = 1
f(x) = 3x + 1
f(1) = 3(1)+ 1
= 3 + 1
= 4