Tubes of oil paint are on sale for $.50 cents off. Cody bought 6 tubes if paint on sale and paid a total of $25.80. Write and sole an equation for "r" for the regular price of the oil paint.
25.80=6(r-.50) 25.80 being how much the total was, 6 being the number of tubes of paint, r being the regular price, and .50 being the price off. 28.50=6r-3 31.50=6r r=5.25 The regular price of the tubes of oil paint is $5.25.
