Transcript Graphing Proportional Relationships
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?
• • 5 20 a true proportion?
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 5 20 a true proportion?
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
Quadrant II
y
Quadrant I
X: move right 2 units
(
2
,
3
)
Y: move up 3 units ( 2 , 3 ) ( 0 , 0 )
(x, y)
origin
Quadrant III Quadrant IV
Helpful Hint The sign of a number indicates which direction to move. Positive: up or right Negative: down or left
x
• • 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