Question 51339
1st chose an easy equation like: Y-5x=3

and move the -5x to the right side so you get Y=5x+3

then you re-place Y with (5x+3) in the 2nd equation 

and you get this 5x-2(5x+3)=-5

5x-10x-6=-5
-5x-6+6=-5+6
-5x=1
x=-1/5

just re-place the x to 5(-1/5)-2y=-5 to get Y

-1-2y=-5
-2y=-4
Y=2

check

5(-1/5)-2(2)=-5
-1-4=-5
-5=-5