Resposta:

Explicação passo a passo:

f(2)=-3

f(-1)=2

f(2)=2a+b=-3

f(-1)=-a+b=2

2a+b=-3

-a+b=2  (-1)

2a+b=-3

  a-b=-2

_______

3a+0=-5

3a=-5

a=-5/3

-a+b=2

-(-5/3)+b=2

5/3+b=2

b=2-5/3

b=6/3-5/3

b=1/3

f(x)=-5/3x+1/3