Question

The length of a rectangular pool is 15 less than three times its width. Its perimeter is 50 meters. Find the length of the pool.

Answer 1

I know it's
50=2L+2W

Answer 2

I don't know what to do from there...

Answer 3

we can use l for length, w will be width, P for perimeter:
l=3w-15, because the length is 15 less than three times its width.
Then is P is 50, P=2l+2w

Answer 4

Can you solve from there?

Answer 5

No....

Answer 6

plug the equation for l into the one for perimeter. It would look like 50=2(3w-15)+2w, because l = 3w-15
After that solve for w.

Answer 7

ohhh ok

Answer 8

Is it 10?

Answer 9

yes, w is 10. now solve for l using the original equation.

Answer 10

15

Answer 11

perfect