Answer:
C
Step-by-step explanation:
Label the two equations:
-2x -y= 9 -----(1)
2x -9y= 1 -----(2)
(1) +(2):
-2x -y +2x -9y= 9 +1
-2x +2x -y -9y= 10
Simplify:
-10y= 10
y= 10 ÷(-10)
y= -1
Substitute y= -1 into (2):
2x -9(-1)= 1
2x +9= 1
2x= 1 -9
2x= -8
x= -8 ÷2
x= -4
Thus, the solution is (-4, -1).
