The given triangle is a 45°- 45°- 90° triangle.

Here the length of the hypotenuse is y, and leg is 3.

The 45°- 45°- 90° triangle has the property that the length of its hypotenuse is

times to the length of a leg.

So, by 45°- 45°- 90° triangle property, or 4.24.

Since 45°- 45°- 90° triangle is an isosceles right triangle,

the two legs have same measure.

So, x = 3.

The value of x is 3 and y is or 4.24.