Question 5402
The easiest way is to pick 3 values for x and then solve for y:

(any three value will work)

If x = -1 then y = -2  because 
 y=2*(x)
y=2*(-1)
y=-2
Plot the point (-1,-2)

If x=0, then y=0 because 
y=2*x
y=2(0)
y=0
Plot the point (0,0)

Draw a line that extends through these two points

Verify it with a third point:
If x=1, then y=2 because 
y=2(x)
y=2(1)
y=2

The point (1,2) should also be on the line you drew.