Question from Bianca, a student:
What is the x-intercept of the graph of y=1/2x+b?
The "x-intercept" is the point on the line where it intercepts the
x-axis. All the points along the x-axis have the value y=0, so
substitute that into your equation:
0 = 1/2x+b
and solve for x.
Stephen La Rocque.