1. Equations of Lines Chapter 3 – 4 pp. 165 - 170
Run Warmup

2. Equations of Lines:
From Algebra 1, you may recall the following equations/formulas:
Slope Formula:
Slope-Intercept Equation:
Point-Slope Equation:

3. An equation in slope-intercept form of the line with slope of 6 and y-intercept of –3 is given by:-3

4. Write an equation in slope-intercept form of the line with slope of –1 and y-intercept of 4.B C D
x + y = 4
y = x – 4
y = –x – 4
y = –x + 4
Lesson 3-4 CYP 1

5. Write an equation in point-slope form
of the line whose slope is
passing through the point (-10, 8) 8
-10

6. Write an equation in point-slope form of the line
whose slope is that contains (6, –3). A B C D
Lesson 3-4 CYP 2

7. 0 – 9 -2 – 4 9 4 Step 1: Find the slope using the formula:
Write an equation in slope-intercept form for a line containing (4, 9) and (–2, 0).
Step 1: Find the slope using the formula:
0 – 9
-2 – 4
Step 2: Substitute into point-slope equation: 9 4

8. Step 3: Simplify to slope-intercept equation:+9 +9

9. Write an equation in slope-intercept form for a line containing (3, 2) and (6, 8).B C D
Lesson 3-4 CYP 3

10. Recall that parallel lines have equal slope values.
Perpendicular lines have slopes that are negative reciprocals of each other .

11. Use three-step process using slope (m) = 2 and point values provided.
Write an equation in slope-intercept form for a line containing (1, 7) that is perpendicular to the line
Use three-step process using
slope (m) = 2 and point values provided.

12. Write an equation in slope-intercept form for a line containing (–3, 4) that is perpendicular to the line A B C D
Lesson 3-4 CYP 4

13. Use the slope formula by using A (-1, 6)and B (3, 2) or any other pair of points with integer coordinates.
Since y-intercept is 5, the equation is:

14. Rise = -6
Slope (m) = -1
Run = 6
y-intercept (b) = 5
Equation: y = -x + 5

15. Tonight’s homework:
Textbook pages 168 – 170,
problems 1 – 9 odd, 13 – 24 all,
25 – 31 odd, & 37 – 40 all.