diketahui f(a)=ax + b.jika f(1)= -1 dan f(3) =5,maka nilai f(-2) =…

f(a) = ax + b

f(1) = x + b = -1
f(3) = 3x + b = 5
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             -2x = -6
                x = 3


3x + b = 5
9 + b = 5
b = -4

f(a) = ax + b
f(-2) = -2(3) + (-4)
       = -6 - 4
       = -10