Pleas answer in two minutes now

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?

Look at the following graph of the given equation. determine whether the equation is a function. explain why or why not.

Need this asap if anyone can i would be very grateful. if you could show workings that would really