X = 0 O 5x + 7 = 37 Plz answer I need da answer

Which triangle congruence postulate or theorem justifies my claim that the steps i made using construction paper and scissors produce an isosceles triangle? was it sss, sas, asa, aas, or hl?

How do you solving the solution of each system using elimination?

If you prove that ∆wxz is congruent to ∆yzx, which general statement best describes what you have proved?