Please help me fast this is due tomorrow!!

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?

Solve 3x-18=2y and 5x-6y=14 by elimination or substitution . show all !

Select all the expressions that will include a remainder.