Question

F(x)=ax+b,f(-2)=12 dan f(5)=15.

Answer 1

F(-2) = 12
a(-2) + b = 12
-2a + b = 12

f(5) = 15
5a + b = 15

kalok disuruh nyarik a dan b nya gini, pakek substitusi,

-2a + b = 12
5a + b = 15
------------------ -
-7a = -3
a= 3/7

-2(3/7) + b = 12
-6/7 + b = 12
b = 12 + 6/7
b = (84+6) / 7
b = 90 / 7
b = 12,85

Answer 2

F(x)= ax + b
F(-2)= a(-2)+b= 12. -2a+b =12
F(5)= a(5)+b = 15. 5a+b = -3
3a. = -3:3
a. = -1


-2a+b= 12
-2(-1)+b= 12
2+b= 12 b = 12-2 b = 10

Jadi a= -1 dan b= 10