1. Warm Up

2. Lesson 56: Identifying, Writing, and Graphing Direct Variation Expressions and Equations, Functions

3. Direct Variation RepresentationDescription Equation Graph A line that always passes through the origin Words

4. Example

7. The number of boys in a class varies directly with the number of girls. One class has 6 girls and 18 boys. How many boys will be in a class with 8 girls?

8. Example The volume of a box with a fixed base varies directly with its height. A box with a height of 4 centimeters has a volume of 29 cubic centimeters. Graph this relationship, and then use a graph to estimate the volume of a box that is 3 centimeters tall.

9. Homework Questions

10. Correcting Homework  Be kind.  Check the paper in front of you. If there is no work shown, return it to its owner.  If the paper in front of you is not in pencil or black ink, return it to its owner.  If the paper in front of you is not complete, return it to its owner.  Remember you are filling out the score sheet for the person that you are correcting.  Be sure to write “C.B. ____________” with your name on the paper you graded and on the score sheet.

11. Homework  1 st and 2 nd hour: Lesson 56 #1-16, 18-19, 24-26, Lesson Practice a-i  3 rd hour: Lesson 56 #8-9, 13-16, 19, 24-26, Lesson Practice e-i