If the graphs of the equations x + y = 0 and 5y + 7x = 24 intersect at (m, n), then the value of m +n is

If the graphs of the equations x + y = 0 and 5y + 7x = 24 intersect at

1.	If the graphs of the equations x + y = 0 and 5y + 7x = 24 intersect at (m, n), then the value of m +n is
A.	2
B.	1
C.	0
D.	-1
Answer» D. -1