Question

Dada a função F(x) = ax+b e sabendo se que F(3)= 5 e F (-2)= -5 calcule F (1/2)

Answer 1

f(3)=5   

3a+b=5

-2a+b=-5x(-1)
3a+b=5
2a-b=5
5a=10

a=10/2=5

3a+b=5

3.5+b=5

15+b=5

b=5-15

b=-10

f(x)=5x-10

f(1/2)=5.1/2-10

f(1/2)=5/2-10

f(1/2)=5-20/2

f(1/2)=-15/2