The length of a rectangle is 8 cm more than 3 times its width. The perimeter of the rectangle is 64cm. Show the equation that would be used to find the dimension of the rectangle.

Question

mathstudent55 · Answer

Choose a variable for the width.
Which variable would you like to use? x, w, b? any other?

anonymous · Answer

variable b

mathstudent55 · Answer

Ok.
b represents the width of the rectangle.
Now we read the problem above, and we write the length in terms of the width using b as the width.

mathstudent55 · Answer

It states above: "The length of a rectangle is 8 cm more than 3 times its width."

mathstudent55 · Answer

Since we are using b as the width, how would you write "3 times the width"?

anonymous · Answer

Would it be variable first or after the number?

mathstudent55 · Answer

The number is first, then the variable.

anonymous · Answer

I would have done (b)3

anonymous · Answer

Thank u!

mathstudent55 · Answer

What you did is not incorrect, but it is usually written as 3b.

mathstudent55 · Answer

Since the width is b, 3 times the width is 3b.
Now we need to deal with the 8.

mathstudent55 · Answer

The length of a rectangle is 8 cm more than 3 times its width.
That means the length is 8 added to 3b.
How do you show that as an expression?