Horizontal lines have zero slope. 3– 5 Write and Graph Equations of Lines Section: Essential How do you write an equation of a line? Question Warm Up: Key Vocab: A linear equation written in the form where is the y = mx + b m slope and is the y-intercept. b Slope-intercept Form Best form for graphing. A linear equation written in the form where and Ax + By = C, A, B Standard form are integers and and are not both zero. C A B A linear equation written in the form , where is the slope and is a m Point-slope Form coordinate. where is the a x-intercept Vertical Line Vertical lines have undefined or no slope where is the b y-intercept Horizontal Line Horizontal lines have zero slope Show: Write an equation of the line in Graph 2x 3y = -12. Ex 1: Ex 2: – slope-intercept form. = 4x - 3 y
Horizontal lines have zero slope. Section: 3– 5 Write and Graph Equations of Lines Essential Question How do you write an equation of a line? Warm Up: Key Vocab: Slope-intercept Form A linear equation written in the form y = mx + b where m is the slope and b is the y-intercept. Best form for graphing. Standard form A linear equation written in the form Ax + By = C, where A, B and C are integers and A and B are not both zero. Point-slope Form A linear equation written in the form , where m is the slope and is a coordinate. Vertical Line where a is the x-intercept Vertical lines have undefined or no slope Horizontal Line where b is the y-intercept Horizontal lines have zero slope Show: Ex 1: Write an equation of the line in slope-intercept form. y = 4x - 3 Ex 2: Graph 2x – 3y = -12.
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