Answer:
(0,-9)
Step-by-step explanation:
2x-y=9 is firsl equation
x=9+y is second equation
put value of x in 1st equation
2(9+y)-y=9
18 +2y-y=9
18+y=9
y=9-18
y=-9
put value of y in st equation
2x-(-9)=9
2x+9=9
x=0
