Algebra
posted by Katrina .
An area, A, consisting of the sum of two squares is 1000. The side of one square is 10 less than 2/3 of the side of the other square. What are the sides of the squares?

Let x,y be the side of each of the squares.
x2 + y2 = 1000
y=(2/3)x10
substitute (2/3)x10 for y in the first equation:
x2 + ((2/3)x10)2 = 1000
Expand and solve for the quadratic equation to get x=30 or x=270/13.
Reject second solution to get x=30, y=10
See also
http://www.jiskha.com/display.cgi?id=1246414274