Attached is a picture of the graph.
How does this graph work? Well, line graphs are relatively easy to do, and once you understand how they work you'll be able to draw line diagrams in no time!
In a line equation, the basic format is y = mx + b.
Now, what does 'm' represent? Essentially, m is the slope, which can be defined as
.
(Oversimplified, it's essentially
)
b is called the 'y - intercept'. When looking at a graph, if you see a point on the line that goes through the y-axis (the vertical line), that would be the y-intercept.
If you have any questions, just ask :))
Good luck!