Find the slope of the line shown on the graph to the right

Ineed in figuring out this problem.

If the sales price of a dvd is $20 and the markup is 34%, what is the cost of the dvd?

Which statements about the system are true? check all that apply. y =1/3 x – 4 3y – x = –7 the system has one solution. the system consists of parallel lines. both lines have the same slope. both lines have the same y–intercept. the equations represent the same line. the lines intersect.