sketch a graph of y=f(x)
This equation in it the slope intercept form.
Y = mX + b where m is the slope and b is the y intercept.
Put a point on the graph at the Y intercept (0, 5)
The slope, m = (change in y) / (change in X) in this case 1/2
From the drqwn point move up 1 and right 2 and place a second point. Draw a line between the 2 points.