You can put this solution on YOUR website! Plug in -3 . Do you get 5 for y?
BTW you are missing y in the first equation.
Is it 5y or 4y?
Just using the second equation
-1/5*y-3x=10
There is a question whether it is -1/5*y or (-1/5)*y
-1/5*5-3(-3)=10
-1+9=10
8=10
The point doesn't work this way.
-1/(5y)-3*(-3)=10
-1/25+9=10
It doesn't work this way either.
So the point does work in equation two so it isn't a solution for the system.
Whether or not it works in the first equation.