Question 892834
x, side of the given square
y, side of the other square


{{{highlight_green(4x=12+4y)}}}, <i>perimeter of a square is 12 cm greater than that of another square.</i>
This equation can be simplified through division by 4:
{{{highlight_green(x=3+y)}}}


The next description should mean "Its" refers to the given square of 4x perimeter.

{{{highlight_green(x^2=39+y^2)}}}


You should find no trouble solving the system:
{{{highlight(system(x=3+y,x^2=39+y^2))}}}