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f(1)=a+b= -2
f(4)=4a+b= 16
a + b = -2
4a+ b = 16
-3a = -18
a = 6
f(1) = a(1) + b = -2
a + b = -2
f(4) = a(4) + b = 16
4a + b = 16
a + b = -2
4a + b = 16 -
-3a = -18
a = -18/-3 = 6