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2=2a+b ...(1)
F(-5)= -5a+b
-33= -5a+b ...(2)
(1)-(2), 7a=35
a=5
sub a ke (1)
2.5+b=2
b=-8
fungsi f(x)=5x-8
f(2)=2a+b=2
f(-5)=-5a+b=-33
-------------------------- -
7a=35
a=35/7
a=5
subtitusikan nilai a=5
2a+b=2
2(5)+b=2
b=2-10
b=-8
Subtitusikan nilai a dan b ke rumus dasar
f(x)=ax+b
f(x)=5x-8 <----- rumus fungsi