To find the slope of the line, use the rise over run formula:
[tex] \frac{y_{2} - y_{1}}{x_{2} - x_{1}}[/tex]
Take any two points from the line and plug them into the formula.
(0,0) and (10, 5)
[tex] \frac{5 - 0}{10 - 0} = \frac{5}{10} = 0.5[/tex]
The slope of the line is 0.5.
Using the form y = mx, the following equation will be your answer:
[tex]y = 0.5x[/tex]