fungsi f di tanyakan dengan rumus F(X)= a×+b jika f(2)=2dan f(-3)=13 maka nilai -a+b adalah??

f(x) = ax + b
f(2) = 2a + b = 2
f(-3) = - 3a + b = 13
---------------------------(-)
5a = - 11
a = - 11/5

2a + b = 2
2(-11/5) + b = 2
- 22/5 + b = 2
b = 2 + 22/5
b = 10/5 + 22/5
b = 32/5

- a + b
= 11/5 + 32/5
= 43/5
= 8 3/5