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- Watch and Read
- - Let's Start Thinking
  - Investigating the Slopes of Horizontal and Vertical Lines
  - Working With Horizontal and Vertical Lines
  - Wrap-Up
  - Alternative Format
- Review
- - Explore This 1
  - Check Your Understanding 1
  - Check Your Understanding 2
- Practise
- - Exercises
  - Answers
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Let's Start Thinking

Horizontal and Vertical Lines

Athletics

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Lesson Goals

Investigate the properties of slope for both horizontal and vertical lines.
Using the properties of slope, solve problems involving horizontal and vertical lines.

Try This

A triangle has vertices located at \(D(-5,10)\), \(E(-5,-5)\), and \(F(10,-5)\). Using slopes, determine if \(\triangle DEF\) is a right triangle.

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