Which expression modeled by the array?

a: 2 * 6 + 4
b: 3 * 5 + 1
c: 4 * 2 + 8
d: 5 * 2 + 6

Given right triangle a w/a hypotenuse length of x+4 and a leg of x, and right triangle b, w/ a hypotense length of 3y and a leg length of y+4 for what values of x and y are the triangles congruent by hl?