what is the right answer for the problem x+y=2 2x+7y=9 by the process of elimination?

Answer 1

x+y=2

multiply by 2

2x+2y=4

2x+7y=9

subtract 2nd from 3rd equation to eliminate x

7y-2y=9-4

5y=5

y=5/5= 1

x=2-1= 1