Let the dryer costs x dollars (an unknown value). Then the washer costs (x-48) dollars, according to the condition. Now I can write this condition dryer + washer = 802 as an equation (x-48) + x = 802. Simplify and solve x - 48 + x = 802 2x = 802 + 48 2x = 850 x = 850/2 = 425 dollars. ANSWER. The dryer costs 425 dollars.