Unit 2 Ratio and Proportional Relationships Lesson 5A Graphing 7.RP.2/ MP: 1-4.

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Presentation transcript:

Unit 2 Ratio and Proportional Relationships Lesson 5A Graphing 7.RP.2/ MP: 1-4

Do Now There are 9 red gumdrops, 10 yellow gumdrops, and 15 orange gumdrops in a bag. What is the ratio of orange gumdrops to red gumdrops in the bag? Is 3 12 a true proportion? 5 20 Solve for x: x = =

Let’s Go Over Homework Answers WB Pg 11 #20-27

DO NOW 1.There are 9 red marbles, 5 yellow marbles, and 12 blue marbles in a bag. What is the ratio of blue marbles to red marbles in the bag? 2. Is 4 16 a true proportion? Solve for x: 6 = 8 12 x

Objective: Students will graph relationships on a coordinate plane and determine if a relationship is proportional.

(2, 3) (x, y) The sign of a number indicates which direction to move. Positive: up or right Negative: down or left Helpful Hint x y origin (2, 3) X: move right 2 units Y: move up 3 units (0, 0) Quadrant I Quadrant II Quadrant III Quadrant IV Review: Graphing on a Coordinate Plane

Ms. Umstetter is planning a year-end pizza party for her students. Cascarino’s Pizza is offering free delivery and charges $8 per medium pizza. 1) complete the table to determine the cost for different numbers of pizzas ordered. Pizza1 Cost ($)816 2) Write the relationship of the cost and number of pizzas as a ratio in simplest form 3) What do you notice about the simplified ratios? 4) Graph the chart on a coordinate plane and connect the points. Describe the graph. 5) Is the relationship proportional?

Graph

Notes Another way to determine whether two quantities are proportional is to graph the quantities on the coordinate plane. If the graph of the two quantities is a straight line through the origin, then the two quantities are proportional.

CW: WB pg 17 HW: Rates & Ratios 2 Wksht