Question 878487
5x-15y=35
15y-10x=-20


is the same as


5x-15y=35
-10x+15y=-20


Add the two equations to get



5x-15y=35
-10x+15y=-20
-------------
-5x+0y = 15


So -5x = 15


This means that we can solve for x to get a specific number. We then use that solution for x to solve for y.


Overall, this system has 1 solution.