Which of the following could be the lengths of the sides of a 45°-45°-90° triangle

Yuto solved the equation below. what is the solution to yuto’s equation?

Quadrilateral wxyz was dilated with the origin as the center of dilation to create quadrilateral w'x'y'z'. the quadrilateral was dilated using a scale factor of 2. the coordinates of the vertices of quadrilateral wxyz are given. you can use the scale factor to find the coordinates of the dilated image. enter the coordinates of the vertices of quadrilateral w'x'y'z'

Solve for x a. b. will mark brainliest!