Question

x+y=0;2x-y=9 solve equation by substitution method​

Answer 1

Answer:

Step-by-step explanation:

1) x+y=0

Let x = 5

⇒5+y=0

⇒y= 0-5=-5

∴x=5,y=-5

2) 2x-y=9

Let x=10

⇒2(10)-y=9

⇒20-y=9

⇒-y=9-20

⇒-y=-11( minus and minus get cancelled)

⇒y=11

∴x=10,y=11