... point-slope and slope-intercept forms of lines through the following pairs of points a) (1,1) and (2,5) b) (1,1) and (5,2) c) (-1,2) and (2,-1) d) (17,122) and (35,-18) e) (a,b) and (3,2) f ) (x, x2 ) and ... be, For loan oft loses both itself and friend, And borrowing dulls the edge of husbandry (The first book dealing with interest and other financial mathematics, by Richard Witt, published in 1623.) ... + L3: y = −3x + And we see that L1 and L2 have the same slope and so are parallel 22 CHAPTER FUNDAMENTALS Fact 1.2 Two lines with slopes m1 and m2 intersect at right angles if and only if m1...