§2.4 Write Equations of Lines CA Standard: Algebra 1: 7.0 Students verify that a point lies on a line, given an equation of the line. Students are able.

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Presentation transcript:

§2.4 Write Equations of Lines CA Standard: Algebra 1: 7.0 Students verify that a point lies on a line, given an equation of the line. Students are able to derive linear equations by using the point-slope formula.

Warm Up 1.Graph 2. Graph x = 3

Key Concept 1.Slope-intercept form a.Use when given slope and y-intercept 2.Point-slope form a.Use when given slope and a point

Key Concept Write equations of lines: two-step process. –Use slope formula to find the slope –Then use point-slope form with either point to find the equation.

EX1: Write an equation of the line shown. y-intercept = ?

EX2: Write an equation of the line that has given slope 5 and y- intercept 1.

EX3: Write an equation of the line that passes through (8, -1) and has a slope of

EX4: Write an equation of the line that passes through (-1, 6) and has a slope of 4.

EX5: Write an equation of the line that passes through (-2, 1) and is parallel to the line. (use point-slope form)

EX5: Write an equation of the line that passes through (-2,1) and is perpendicular to the line. (use point-slope form)

EX6: Write an equation of the line that passes through (0, 1) and is (a) parallel to, and (b) perpendicular to, the line a) b)

EX6: Write an equation of the line that passes through the given points. 1.(-8, 20) and (-6, 15) 2. (-1, 2) and (10, 0)

Homework 9/26/2014 Pg. 101 #9-45 odd, 46 Quiz on Section 2.4 next class