F (x) =ax+b f (2) =-3 f (-3) f (-3) =7 tentukan nilai a dan b

F(2) = 2a+b = 12

F(-3) = -3a + b = -23

Pakai cara subsitusi

2a+b=12

-3a+b =-23 dikurang

5a = 35  

A = 7

-21 + b = -23  

B = -2