The slope of a line is given by:
[tex]m=\frac{y_2-y_1}{x_2-x_1}[/tex]
From the graph we notice that the line passes through the points (0,0) and (2,-1), then:
[tex]\begin{gathered} m=\frac{-1-0}{2-0} \\ m=-\frac{1}{2} \end{gathered}[/tex]
therefore the slope is m=-1/2.
The y-intercept if the value of y when x=0, from the graph we conclude that b=0.
The equation of the line is:
[tex]y=-\frac{1}{2}x[/tex]
