What dose 3x-5y=15 and 2x-y=-4 really equel

The correct answer would be (-5,-6). Hope that helps!

3x - 5y = 15 > 1 
2x - y = -4 >2 
multiply eqn2 by -5 and add eqn 1 
3x-5y = 15 
-10x +5y = 20 

-7x = 35 
x = -5 
sub in eqn 2 
2(-5) - y = -4 
-10 - y = -4 
-y = -4+10 
-y = 6 
y = -6 
so the answer is (-5, -6)

The first one, i believe, would be correct. all the others have one thing in common, and that's that they have repeating numbers. in the second one, x and y have repeating 6's and 3's, and in the third, x and y have repeating 6's as well. in the last one, there are repeating 3's. the first one has no repeating numbers.