eliminasi dari f(x)=ax+b dengan f(-1)= 2 dan f(2)= 11

f(x) = ax + b

f(-1) = 2
f(-1) = -a + b = 2 ..... (1)

f(2) = 11
f(2) = 2a + b = 11 .... (2)

eliminasi 1 & 2
-a + b = 2
2a + b = 11 -
------------------
-3a = -9
a = 3

-a + b = 2
-3 + b = 2
b = 5