Question

Y= 2x
2x + y=8
Does anyone know the answer

Answer 1

x is 2, y is 4

Explanation:

`{ \tt{y = 2x - - - (a)}} \\ { \tt{2x + y = 8 - - - (b)}}`

» Substitute for y in equation (b) with that in equation (a)

`{ \tt{2x + 2x = 8}} \\ { \tt{4x = 8}} \\ { \tt{x = 2}}`

» Find y

`{ \tt{y = 2 * 2}} \\ { \tt{y = 4}}`