244 Chapter 3 Graphing Linear Equations in Two Variables m 5 9 5. 6. 2y 3 0 x-intercept: none; 2x 4y 5 4 y 1 y-intercept: (0, ) 32 543 21 1 2 3 4 5 Concept 1: Introduction to Slope 5 4 y 3 2 1 2x 4y 543 1 2 3 4 5 2 1 1 2 3 4 5 x 7. Determine the pitch (slope) of the roof. 8. Determine the slope of the stairs. (See Example 1.) 8 ft 24 ft 18 ft 9. Calculate the slope of the handrail. 10. Determine the slope of the treadmill. m 1 8 m 6 11 3 ft 5.5 ft 8 ft 1 ft Concept 2: Slope Formula For Exercises 11–14, fill in the blank with the appropriate term: zero, negative, positive, or undefined. 11. The slope of a line parallel to the y-axis is . 12. The slope of a horizontal line is . 13. The slope of a line that rises from left to 14. The slope of a line that falls from left to right right is . is . For Exercises 15–23, determine if the slope is positive, negative, zero, or undefined. 15. 16. 17. 1 2 3 4 5 5 4 y 1 1 2 3 4 5 x 3 2 1 2 3 4 5 54 321 5 4 y 1 1 2 3 4 5 x 3 2 1 2 3 4 5 54 321 5 4 y 1 1 2 3 4 5 x 3 2 54 321 undefined zero positive negative Negative Undefined Zero 10 ft m 1 3 Writing Translating Expression Geometry Scientific Calculator Video 2 3 4 5 x 3 2 1 2y 3 0 x-intercept: (0, 0); y-intercept: (0, 0)
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