SOLUTION: A square animal pen and a pen shaped like an equilateral triangle have equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are fifteen les

Algebra ->  Algebra  -> Coordinate Systems and Linear Equations  -> Linear Equations and Systems Word Problems -> SOLUTION: A square animal pen and a pen shaped like an equilateral triangle have equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are fifteen les      Log On

Ad: You enter your algebra equation or inequality - Algebrator solves it step-by-step while providing clear explanations. Free on-line demo .
Ad: Algebrator™ solves your algebra problems and provides step-by-step explanations!
Ad: Algebra Solved!™: algebra software solves algebra homework problems with step-by-step help!

   

Question 126053This question is from textbook
: A square animal pen and a pen shaped like an equilateral triangle have equal perimeters. Find the length of the sides of each pen if the sides of the triangular pen are fifteen less than twice a side of the square pen.
What I know: P=4s and P=3a, a=2s-15. That's all. I don't know how to use that information, if it's useful in solving the problem, or how to get started on the problem. I've tried drawing pictures and solving for various things, I'm seriously stumped and any help would be GREATLY appreciated. Thank you so much.This question is from textbook

Answer by scott8148(5895) About Me  (Show Source):
You can put this solution on YOUR website!
good so far __ the perimeters are EQUAL __ P=P __ 3a=4s

substituting __ 3(2s-15)=4s __ 6s-45=4s __ 2s=45