Answer:
a) m = 4/5, b = -3
y = (4/5)x - 3---slope-intercept form
b) The original line has slope 4/5, so a perpendicular line will have slope -5/4.
An equation for this line is y = (-5/4)x + c, where c is any constant. For example, if
c = 0, then y = (-5/4)x.
To graph y = (-5/4)x:
Start at the origin. Go up 5 units, then left 4 units. Plot the point (-4, 5). Draw a straight line that goes through these two points.