SOLUTION: I am trying to do an nineth grade math class in the eighth grade. This is my first advanced class and am struggling really horribly. We are learning Defining one variable in terms

SOLUTION: I am trying to do an nineth grade math class in the eighth grade. This is my first advanced class and am struggling really horribly. We are learning Defining one variable in terms

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Question 222001: I am trying to do an nineth grade math class in the eighth grade. This is my first advanced class and am struggling really horribly. We are learning Defining one variable in terms of another. I have the problem: The length of a rectangle is 3 inches more than the width. The perimeter is 30 inches. Define a variable for the width, Write an expression for the length in terms of the width, Write an equation to find the width of the rectangle. Solve you equation, and what is the length of the rectangle.
Answer by solver91311(24713) (Show Source): You can put this solution on YOUR website!

Let

represent the width of the rectangle. The length is 3 inches more than that, so if the length is

then

(that's your expression for length in terms of width)

The perimeter of a rectangle is given by:

.

Let's plug in what we know:

The width is

, the length is

, and the perimeter is 30, so:

That is now an equation to find the width of the triangle. Just solve for

to get the width, and add 3 to get the length.

John

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