Diketahui fungsi f(x)= 3x+10 jika f(-1) = a dan f(b)= -2, nilai a+b adalah

f(x) = 3x + 10

f(-1) = 3(-1) + 10
a = -3 + 10
a = 7

f(b) = 3(b) + 10
-2 = 3b + 10
3b = -2 - 10
3b = -12
b = -12/3
b = -4

Nilai a + b
= 7 + (-4)
= 7 - 4
= 3