A: $620
Explanation:
first set your variables:
refrigerator: r
washer: w
dryer:d
next create your equation:
1800= r+w+d
now use what you know to solve the problem. you know how much the refrigerator and dryer cost, so create an equation based off that knowledge.
r = 250 + w
d = 1/2w
now substitute those equations for the variables:
1800 = 250 + w + 1/2w + w
(r) (d)
combine like terms:
1800 = 250 + 2w + 1/2w
1800 = 250 + 2.5w
subtract 250 from both sides:
1550 = 2.5w
divide by 2.5:
w= 620
if you want to check, plug in the w value and see if everything equals 1800:
1800 = 250 + 620 + 1/2(620) + 620
1800 = 870 + 310 + 620
1800 = 1800
it is correct, hope this helps :))
