f(x) = ax+b
f(-1) = -a+b = 3
f(3) = 3a+b = 1
-a+b = 3 .(-1)
3a+b = 1
I)a-b = -3
II)3a+b = 1
I+II)4a = -2
a = -1/2
b = 5/2
f(1) = a+b = -1/2 + 5/2 = 2(letra A)
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Verified answer
f(x) = ax+b
f(-1) = -a+b = 3
f(3) = 3a+b = 1
-a+b = 3 .(-1)
3a+b = 1
I)a-b = -3
II)3a+b = 1
I+II)4a = -2
a = -1/2
b = 5/2
f(1) = a+b = -1/2 + 5/2 = 2(letra A)
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