you set those equations up nicely one on top of the other makes it easier, just draw a pretend line and add the 2 equations
2x + x = 3x
+5y-5y=0 cancels out
0+(-15)= -15
3x = -15 divide 3 by each side
x = -5 plug this back into the equation to get the y value this is one of your answers now you have to find the y value (iam lazy )