Lesson 1-2 Slopes of Lines. Objective: To find the slope of a line and to determine whether two lines are parallel, perpendicular, or neither.

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Presentation transcript:

Lesson 1-2 Slopes of Lines

Objective:

To find the slope of a line and to determine whether two lines are parallel, perpendicular, or neither.

Slope

A number measuring the steepness of the line relative to the x-axis.

Slope

Horizontal lines have a slope of ???

Slope Vertical lines have a slope of ???

Slope Lines with a positive slope slant ???

Slope Lines with a negative slope slant ???

Slope The slope of the equation y = mx + k is ???

Slope The slope of the equation y = mx + k is ??? This is called slope- intercept form.

What are the slope and y – intercept of the line 7x + 13y = 26?

Slope What do you know about the slopes of parallel lines?

Slope What do you know about the slopes of perpendicular lines?

A line l has equation x + 2y = 5. What is the slope of a line (a) parallel to l? (b) perpendicular to l?

The equations of three lines are given. Which lines are parallel and which are perpendicular? a. y = ¾ x – 7 b. 4x + 3y = 10 c. 3x – 4y = 11

Find the value of k if the line joining (2, k) and (4, 5) and the line y = 3x + 1 are (a) parallel, (b) perpendicular.

Assignment: Pgs C.E.  1-14 all, W.E.  1-27 odd