Assume the expression is x = 40 - 4y, and assume we want to solve for y.
Rearrange the terms to get:
x - 40 = -4y
y = -¼(x - 40)
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3 x40 + 3 x 2 = 120 + 6 = 126
20 feet times 40 feet = 800 square feet
If the room is a rectangle then the area is 13 times 40 = 520 square ft.
8 + x 40 is not a valid mathematical expression.
For area measurements, you multiply the length by the width. Here the calculation gives you an answer of 1,400 square feet. Divide by 9 to get 155.56 square yards.