One question i need with, i would really appreciate the .

At first, she had  +2y  in the upper and  -5y  in the lower.

She multiplied the upper by  5 .  Then she had  +10y in the upper.

She should multiply the lower by  2 .  Then she'll have  -10y
there.  She'll be able to add the two equations, and the 'y's will
go away.  She'll be left with a single equation with only 'x' in it,
and she can solve that one for the value of 'x'.

Distributive property