Answer:
x = 4; y = 9; length of a side = 5
Step-by-step explanation:
Here, you're expected to use the fact that all of the sides of a square are the same length.
The left and right sides both have different expressions only in y, so it is convenient to equate them.
... y -4 = 2y -13
... 0 = y -9 . . . . . subtract the left side
... 9 = y . . . . . . . add 9
This tells us the side of the square (s) is ...
... s = y -4 = 9 -4
... s = 5
And we can use this to find x.
... 5 = 2x -3 . . . . equate the x-expression to the square side length
... 8 = 2x . . . . . . add 3
... 4 = x . . . . . . . . divde by the coefficient of x
x and y are 4 and 9; the square side length is 5.
