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2.4 Write Equations of Lines Date: 9/4 Objective: Use point slope formula to write and equation of a line.

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Presentation on theme: "2.4 Write Equations of Lines Date: 9/4 Objective: Use point slope formula to write and equation of a line."— Presentation transcript:

1 2.4 Write Equations of Lines Date: 9/4 Objective: Use point slope formula to write and equation of a line.

2 Slope Intercept Form: y = mx + b Point Slope Formula: y – y 1 = m(x – x 1 ) If Given a slope m and a point (x 1, y 1 ), then use point slope formula to write an equation of a line that passes through the point using that slope. If Given (x 1, y 1 ) and (x 2, y 2 ) then you must find the slope first using the slope formula, then use the point slope formula to write the equation of the line.

3 Example: Write an equation when given the slope and y-intercept. m = ¾ b = -2

4 Write an equation when given the slope and a point. Write an equation of a line that passes through (5,4) and has a slope of -3.

5 Write an equation of a line when given two points. Write an equation of a line that passes through the points (5,-2) and (2,10). 1 st : Use slope formula to find (m = ) 2 nd : Use point slope formula

6 Write equations of parallel or perpendicular lines. Write an equation of the line that passes through (-2,3) and is (a) parallel to and (b) perpendicular to, the line y = -4x + 1.


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