Answer:
y = 4
Step-by-step explanation:
1. Set both equations equal to x
y=2x
x=1/2y
The other is already equal to x: x=-y+6
2. Set what is equal to x equal to each other
1/2y = -y + 6
3. Solve for y
3/2y = 6
y=4
x = -y +6
Substitute this into
y =2x
y =2 (-y+6)
Distribute
y = -2y +12
Add 2y to each side
y+2y = -2y +2y +12
3y =12
Divide each side by 3
3y/3 =12/3
y =4
