1. TEST 1-4 REVIEW
381 Algebra

2. Parallel Lines Two lines that never intersect Both have the same slope
Characteristics
Two lines that never intersect
Line A contains (-6, 1) and (3, 7)
Line B contains (-3, -6) and (9, 2)
Both have the same slope
Parallel Lines
Description
Example
Graph

3. Perpendicular Lines The slope has opposite signs and are reciprocals
Characteristics
Two lines that intersect to create a 90 degree angle.
Line A contains (4, 2) and (-8, -7)
Line B contains (9, -5) and (-9, 19)
The slope has opposite signs and are reciprocals
Perpendicular Lines
Description
Example
Graph

4. y-5 = 1/2(x-1)
Original slope:
Parallel slope:
Perpendicular slope:

5. y = 3x +5
What is the equation in Point slope form parallel to (-1, 3)?

6. 3x + 7y = 21
Original Slope:
Parallel slope:
Perpendicular slope:

7. What describes x = -2?
1. parallel to x-axis
2. perpendicular to the x-axis
3. parallel to y-axis

8. (-7, -5) (-7, 5)
What is the equation of the line?

9. Write an equation parallel to the table.x y -2 4 8 2 12 16 6 20 24

10. Write a function perpendicular to the line shown on the graph.

11. y = 5
Write 3 points contained on the line.

12. Write the equation of a line with an undefined slope.