Find slope and the y-intercept of the lines described by the equation below

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?

What is the point-slope equation of a line with slope -5 that contains the point (6,3)

Iam a rectangle. my perimeter is 60 feet. how much are do i cover?