fungsi didenfinisikan dengan f(x)= ax + b, jika f(3) = 5 dan f(1) = -3. nilai a dan b adalah?

f(x) = ax + b

f(3) = 3a + b = 5
f(-1) = - a + b = - 3
-------------------------(-)
4a = 8
a = 2

subtitusi
- a + b = - 3
- 2 + b = - 3
b = - 3 + 2
b = - 1

nilai a = 2 dan b = - 1