Having difficulties with this problem

A rectangular field is eight times as long as it is wide. If the perimeter of the field is 990 feet, what are the dimensions of the field?

A) Write an equation you can use to answer the given question. Let http://www.imathas.com/cgi-bin/mimetex.cgi?{w} be the width of the field. Do not solve the equation yet.

The equation is ___________ (Make sure you use the correct variable.)

B) Use your equation to find the dimensions of the field.

The width of the field is _________ feet.

The length of the field is _______ feet.

Re: Having difficulties with this problem

Call the width $\displaystyle x$ therefore the length is $\displaystyle 8x$ .

If the perimeter is $\displaystyle 900$ and the formula for perimeter is $\displaystyle P = 2W+2L $ then your equation is $\displaystyle 900 =2\times x+ 2\times 8x$

To solve this equation group some like terms and use inverse operations to solve for $\displaystyle x $