Martin-Gay, Beginning Algebra, 5ed 22

33

44

55 Find the slope of the line through (4, – 3 ) and (2, 2). If we let (x 1, y 1 ) = (4, – 3) and (x 2, y 2 ) = (2, 2), then Note: If we let (x 1, y 1 ) be (2, 2) and (x 2, y 2 ) be (4, – 3), then we get the same result. Example:

Martin-Gay, Beginning Algebra, 5ed 66 Positive Slope: m > 0 x y Lines with positive slopes increase from left to right. Negative Slope: m < 0 x y Lines with negative slopes decrease from left to right. I call these “diagonal lines”.

Martin-Gay, Beginning Algebra, 5ed 77 (2, 4) (6, 1)

Martin-Gay, Beginning Algebra, 5ed 88

99

10

Martin-Gay, Beginning Algebra, 5ed 11

Martin-Gay, Beginning Algebra, 5ed 12

Martin-Gay, Beginning Algebra, 5ed 13

Martin-Gay, Beginning Algebra, 5ed 14