tolong ya di beri tau no 3 dan 4 ,dikasik tau juga ya cara jawab dan jawabannya

3. f(x) = ax+b
f(3)= 3a+b = -13
f(-2)= -2a +b = 17
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5a = -30
a = -6
f(-2) = -2a + b =17
-2.-6+b = 17
12 + b = 17
b = 17-12
b = 5
rumus baru f(x) = -6x + 5x
f(2) = -6.2 + 5.2
= -12 + 10
= -2