Section 1
1. Section 1
1.19. Explore 4
Section 1: Slope—Physical Objects
Self-Check 3
Complete each sentence by filling in the blanks.
- When calculating the horizontal slope, the value of the _________ is always zero and, therefore, the slope is always _____________. Answer
- When calculating the vertical slope, the value of the _________ is always zero and, therefore, the slope is always _____________. Answer

It is now time to add new math terms to your Mathematics 20-3: Glossary Terms document.
In this lesson the new terms you will add are
- undefined slope
- zero slope
- grid
- constant slope

At this time, you may want to add the slope formula to your Formula Sheet.