Fungsi dinyatakan dengan rumus f(x)=ax+b. Jika, f(2)=3 dan f(-3)=13, maka nilai -a + b adalah...

f(x) = ax + b

f(2) = 2a + b = 3

f(-3) = -3a + b = 13 -

                5a    = -10

                   a   = -10 / 5 = -2

2a + b = 3

2(-2) + b = 3

-4 + b = 3

b = 4 + 3

 b = 7

f(x) = -2x + 7

a = -2

b = 7