Diketahui f(x)=ax+b. Jika f(2) =4 dan f(-3)=-11, nilai f(1)=

jawab

f(2)= 4
f(-3) = -11 .....(-)
(2+3)a = 15
5a = 15
a= 5

f(2) = 4
b = 4 - 2a  = 4 - 10
b = -6

f(x) = 5x - 6
f(1) = - 1

[tex]f(2) = 4 \\ 2a + b = 4 \\ f( - 3) = - 11 \\ - 3a + b = - 11 \\ dieliminasi \: menghasilkan \: 5a = 15 \\ a = 3 \\ \\ 2a + b = 4 \\ 6 + b = 4 \\ b = - 2[/tex]
f(x) = ax + b
f(x) = 3x - 2
f(1) = 3 - 2 = 1