fungsi f(x) = px + q mempunyai f(-1) = 2 dan f(1) = 8. nilai f(4) adalah...

[tex] - p + q = 2 \\ p + q = 8 \\ p = 3 \\ q = 5 \\f(x) = 3x + 5 \\ f(4) = 3 \times 4 + 5 = 17[/tex]