Question

NEED HELP ASAP
Solve the system by substitution.
x=y
x-2y=7​

Answer 1

y = 7+ 2y

x = 7 + 2y

Explanation:

`x = y - - - - (1)\\ x - 2y = 7 - - (2) \\from \: equatin \: (2) \\ x = 7 + 2y - - - (3) \\ substitube \: equation \:( 3) into \: (1) \\ 7 + 2y = y \\ y = 7+ 2y`

Answer 2

y=-7 x=-7
You can substitute the x in the second equation for y because they’re equal. So the equation becomes: y-2y=7. Then you solve that to get: -y=7, or y=-7.