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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: 8 = 6 12 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? 5 20 3. Solve for x: 6 = 8 12 x Objective: • Students will graph relationships on a coordinate plane and determine if a relationship is proportional. Review: Graphing on a Coordinate Plane y Quadrant II X: move right 2 units (2, 3) Y: move up 3 units (x, y) Quadrant I (2, 3) x (0, 0) origin Quadrant III Helpful Hint The sign of a number indicates which direction to move. Positive: up or right Negative: down or left Quadrant IV • Ms. Umstetter is planning a year-end pizza party for her students. • Cascarino’s Pizza is offering free delivery and charges $8 per medium pizza. • 1) complete the table to determine the cost for different numbers of pizzas ordered. • Pizza • Cost ($) 1 8 16 • 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