First, you need to find the slope.
m=
=

slope: m= 1/2x
Next, find the y-intercept.
Y-Intercept: 1/2
y=mx+b
Equation: y= 1/2x+1/2
The y-intercept is the point on the y-axis. When you're graphing, you need to graph the y-intercept first. Then graph the slope.
Hope this helps!