Dik rumus suatu fungsi f(x) = ax+b f(3) =5 dan f(-1)=-3 nilai f(4)

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

3a + b = 5
3(2) + b = 5
6 + b = 5
b = 5-6
b = - 1

f(x) = ax + b
f(4) = (2.4) + -1
f(4) = 8 -1
f(4) = 7