4a + 3 - 9 = -7 + 2 + a

Just tell me how to set up the equation.

Aline passes through 3,7 and 6,9 what equation represents the line

Norder to get a certain shade of blue paint, a mixer must have 5 parts white paint to 3 parts blue. if 4 gallons of paint must be mixed, how many gallons of white paint must be used?