Slope-intercept form: y = mx + b Ex. 1 Sketch THE graph for each equation a. Y = 2x + 1b. 3x + y = 5 Y = -3x + 5.

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Slope-intercept form: y = mx + b Ex. 1 Sketch THE graph for each equation a. Y = 2x + 1b. 3x + y = 5 Y = -3x + 5

Slope of horizontal line: Slope of vertical line: 0 undefined Slope of a line: Ex. 2 find the slope of the line passing through each pair of points a. (-2, 0) and (3, 1) b. (3, 4) and (3, 1)

Point-slope form: y – y 1 = m(x – x 1 ) Ex. 3 find the lope-intercept form of the equation of the line that has slope of 5 and goes through (4, -7) Y – –7 = 5(x – 4) Y + 7 = 5x – 20 Y = 5x – 27

Slope of parallel lines: Slope of perpendicular lines: same neg. reciprocal Ex. 4 Find the slope-intercept forms of the equations of the lines that pass through the point (3, -5) and are (a) parallel and (b) perpendicular to the line 2x – 3y = 5 2x – 3y = 5 – 3y = –2x + 5 y = 2/3x + 5/3 (A) Parallel y – – 5 = 2/3(x – 3) y + 5 = 2/3x – 2 y = 2/3x – 7 (B) Perpendicular y – – 5 = –3/2(x – 3) y + 5 = –3/2x + 9/2 y = –3/2x – 1/2

Ex. 5 The maximum recommended slope of a wheelchair ramp is 1/12. A business is installing a wheelchair ramp that rises 22 inches over a horizontal length of 24 feet. Is the ramp steeper than recommended? Ex. 7 A college purchased exercise equipment worth $12,000 for the new campus fitness center. The equipment has a useful life of 8 years. The salvage value at the end of 8 years is $2000. Write a linear equation that describes the book value of the equipment each year. 1/12 = Ramp is not steeper (0, 12000) and (8, 2000) V – = –1250(t – 0) V = –1250t

Ex. 8 The sales per share for Starbucks Corporation were $6.97 in 2001 and $8.47 in Using only this information, write a linear equation that gives the sales per share in terms of the year. The predict the sales per share for (1, 6.97) and (2, 8.47) y – 6.97 = 1.5(x – 1) y = 1.5x y = 1.5(3) y = 9.97 $ 9.97 per share in 2003 (estimate based on our equation) $ per share in 2003 (actual)