diketahui fungsi f(x)=ax+b.jikaf(2)=-2 dan f(3)=13 tentukan nilai f(4)

f(2) = -2
-2 = a.2 + b
2a + b = -2
b = -2 - 2a
f(3) = 13
13 = a.3 + b
3a + b = 13
3a - 2 - 2a = 13
a = 13 + 2
a = 15
b = -2 - 2(15)
b = -2 - 30
b = -32
f(x) = 15x - 32
f(4) = 15(4) - 32
f(4) = 60 - 32
f(4) = 28