You can read the tick marks from the graph.

You can also zoom selected part of the graph to see the marks better.

The X-intersection you will find by solving the equation:

5x - 7 = 0

5x = 7

x = 7/5

x = 1 2/5

So, another point from the graph is (1 2/5, 0).

Now, that you have 2 points of the line, you can draw the line.