Tentukan nilai a dan b dari rumus f(x) = ax + b. Jika diketahui f(-2) = -8 dan f(5) = 13, beserta caranya! Trims.

bismillah

f(x) = ax+b
f(-2) = -8
f(5) = 13

f(-2) = a. (-2) + b
-8 = -2a + b

f(5) = a.5 + b
13 = 5a + b

metode eliminasi
-2a+b = -8
5a+b = 13
--------------- -
-2a-5a = -8-13
-7a = -21
a = -21/-7
a= 3

5a+b = 13
5*3 + b = 13
15 + b = 13
b = 13-15
b= -2

semoga bermanfaat..
teruslah berlatih...