Question

x + y = 0 ; 2 x - y = 9​

Answer 1

Answer:

PLEASE MARK AS BRAINLIEST

x = 3, y= -3

Step-by-step explanation:

2x - y = 9

x + y = 0

2x + 2y = 0

2x - y = 9

3y = -9

y = -3

x = 3

Answer 2

Answer:

x+2x+y-y=0+9

=3x=9

=x=9/3

=x=3

x+y=0

3+y=0

y=0-3

y= -3