2x - y = 3 show the work and a graph

First of all, if we want to graph this we will need to make it into slope intercept form

2x - y = 3
add y to both sides
2x = y + 3 
subtract 3 from both sides
2x - 3 = y
flip the equation
y = 2x -3

we now know that the y-intercept is at (0, -3)
using that we plot the first point
The slope is 2 
(this means up 2 over 1)
using that we make a line

(I'm sure you can graph it ;D)

Hope this helps :)