Question

1) The perimeter of a rectangular classroom floor is 90 feet. The length of the floor is twice the

width. Which equation would NOT help us solve for the length and width of the classroom? Show your
your
work on
scratch paper. *
x + 2y = 90
x = 2y
2(2y) + 2y = 90
2x + 2y = 90​

Answer 1

Answer: The equation would NOT help us solve for the length and width of the classroom is "
`x + 2y = 90`".

Explanation:

Let y be the width of the rectangular classroom floor and x be the length of the rectangular classroom floor .

Given ,

The perimeter of a rectangular classroom floor is 90 feet.

The length of the floor is twice the width.

i.e. Length =2 (width)

i.e. x= 2y ..(i)

Also, perimeter = 2(length+width)

`i.e. 2(x+y)=90\\\\\Rightarrow\ 2x+2y=90`

When we put value of x from (i), we get

`2(2y) + 2y = 90`

Hence, the equation would NOT help us solve for the length and width of the classroom is "
`x + 2y = 90`".