Show that if two nonvertical lines are parallel, their slopes are equal. Start by letting...

Show that if two nonvertical lines are parallel, their slopes are equal. Start by letting the two lines be show /1: y = m1x + b1 and /2: y = m2x + b2 (b1 > b2). that if (x 1, y1) and (x2, y2) are on /1, then

(xb y1 – (b1 – b2)) and ( fo, y2 – (b – b2)) must be on /2. Then by computing m1 and m2, show that m1 = m2. (See the accompanying figure.)