Pls Answer And explain the question below

What is the missing step in this proof ?

Find the commission on a $590.00 sale if the commission is 15%.

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.