Q: If the perimeter of a rectangle is 72 and we know that the length is 8 cm less than twice the width, which of the following best represents the formula we will use to find the length and width?

A: Solution:
l = length w = width
Start with what you know and form equations. [ The perimeter is the distance of all sides added..length + length + width + width is equal to the perimeter or 2(length) + 2 (width) = perimeter
So: you could say 2l + 2w = 72 then you know that the length is 8 less then twice the width. l = 2w - 8..now that we have 2 equations we can find the
solutions.
Since we

know that l = 2w - 8 we can substite l from this equation into the other one.
2(2w - 8) + 2w = 72
4w - 16 + 2w = 72 (answer)
]

bongche|Points 3406|

Rating

There are no new answers.

26,811,918 questions answered

There are no comments.