ap jwbbnnya?? tolong dibantu yh ...makasih

f(x) = mx + n
f(3) = 3m + n = 12
f(4) = 4m + n = -2

(*) 3m + n = 12
4m + n = -2 -
--------------------
-m = 14
m = -14

(*) 3(-14) + n = 12
-42 + n = 12
n = 12 + 42
n = 54

f(-3) = -3m + n
= -3(-14) + 54
= 42 + 54
= 96