1. Equations Of Slope
Graphing Day 3

2. SLOPE-Intercept Review
Peanut-Butter Jelly Time!
SLOPE-Intercept Review

3. opposite the same reciprocals
Equations – Notes

4. zero undefined Equations – Notes x = 5 y = 5 x = -3 y = 1 y-axis

5. equation
slope
coefficient
x-term
Equations – Notes

6. Are these lines parallel, perpendicular, or neither (oblique)?
y = -3x and y = 3x
Are the slopes the same? No
Oblique
Are the slopes the opposite reciprocals? No
Class Example 1

7. Plot two points that would lie on the line perpendicular to line CD through point X.
−6 9 = −2 3
Original slope -6
Opposite Reciprocal
𝟑 𝟐
Perpendicular slope +9
Any two of the purple dots are correct.
Class Example 2

8. Line p contains the points (0, 2) and (-1, 5)
Line p contains the points (0, 2) and (-1, 5). Which of the following pairs of points define a line parallel to line p?
A. (4, 3) and (5, 6)
B. (-1, 0) and (2, 1)
C. (9, -2) and (3 ,0)
D. (3, -1) and (4, -4)
5−2 −1−0 = 3 −1 =−3
Original slope
6−3 5−4 = 3 1 =3 A.
Neither
Oblique
1−0 2−−1 = 1 3
Opposite
Reciprocal B.
Perpendicular
0−−2 3−9 = 2 −6 = 1 −3 C.
Neither
Oblique
−4−−1 4−3 = −3 1 =−3
Parallel D.
Same
Class Example 3

9. Student Example 1 Which line below would be parallel to x = 4?
A y = 4
B. x = -2
C. y = 4x
D. y = -¼x
Student Example 1

10. Plot two points that would lie on the line parallel to line CD through point X.
Student Example 2

11. Line p contains the points (-2, 1) and (-2, 6)
Line p contains the points (-2, 1) and (-2, 6). Which of the following pairs of points define a line perpendicular to line p?
A. (4, 3) and (7, 6)
B. (-1, 0) and (2, 2)
C. (9, 0) and (3, 0)
D. (-3, -1) and (-3, -4)
Student Example 3