Ethan created three triangles: triangle X, triangle Y, and triangle Z. If Triangle Y is congruent to triangle X and Triangle Y is congruent to triangle Z, which must also be true?

Jeremy wants to determine the number of solutions for the equation below without actually solving the equation.

Right ∆abc has coordinates a(-7, 3), b( -7, 10), and c(-1, 3). the triangle is reflected over the x - axis and then reflected again over the y - axis to create ∆a'b'c'. which are the coordinates of vertex a'?

Can someone me with these questions? ?