For the graph given, (a) find the equation of the line in point-slope form, (b) use the eq...

For the graph given, (a) find the equation of the line in point-slope form, (b) use the equation to predict the x- and y-intercepts, (c) write the equation in slope-intercept form, and (d) find y when x = 20, and the value of x for which y = 15.