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Warm UpGraph : y = 3.5Graph: x = 5
What is the slope? What is the slope?
HW Solutions Prac 23 # 1751 odd
Writing Equations of Lines
Need 2 things: slope and yintercept
Example:
1. Write the equation of a line that has a slope of 5 and a y-intercept of - 6.
Steps (using y = mx + b)
1. Find m
2. Find b
3. Write the equation.
2. Write the equation of a line that has a slope of 3 and goes through the point ( 2, 8).
3. Write the equation of a line that has a slope of 3/4 and goes through the point ( 8, - 2).
Note: slope formula
m =
4. Write the equation of a line going through the points (3, 5) and ( - 1, 9).
5. Write the equation of the line containing the points ( 8, 3) and ( 4, 5 ).
6. Write the equation of the line containing the points ( 3, 1) and ( 2, 3 ).
Writing Equations of
Parallel and Perpendicular Lines
Write the equation of the line that goes through the point ( - 3, - 5) and is parallel to the line y = - 2x + 3.
Graph both lines.
Through ( - 4, 1) ; parallel to y = 3/4x - 5
Through (2, - 2) ;perpendicular to y = -2x - 4 Graph both lines.
Through (4, - 3);perpendicular to y = 4/5x + 1
HW # 23 Worksheet # 1-14
** Quick Quiz Thursday
Parallel lines, Perpendicular lines, slopes, slope formula, equations of lines
