I cannot graph on this site using my keyboard. However, I can answer the question posted.
y = kx is a form of direct variation equation, where k is the constant of variation.
You were given a point where x = 1 and y = 2.
We first need to find k.
2 = (1)k
2 = k
Then your direction variation equation is y = 2x.
You can now use y = 2x to graph a linear equation on the xy-plane.