Which of these is a true statement?

In the diagram, the ratios of two pairs of corresponding sides are equal to prove that almn - axyz by the sas similarity theorem, it also needs to be shown that x 6 z un z zz un = 2x zləzz lezy

2/3(-6y+9x) expand each expression using the distributive property

3.4a=57.8 what is the the value of a