Resposta:
B) f(x) = 2x - 4
[tex]\Large\boxed{\begin{array}{l}\sf\dfrac{x}{p}+\dfrac{y}{q}=1\\\\\sf\dfrac{x}{2}+\dfrac{y}{-4}=1\cdot4\\\\\sf 2x-y=4\\\sf y=2x-4\\\sf f(x)=2x-4\\\huge\boxed{\boxed{\boxed{\boxed{\sf\red{\maltese}\blue{~alternativa~B}}}}}\end{array}}[/tex]
