Graph Functions

1
Graph Functions

• By Mr. Bales

2
Objective

• By the end of the lesson, you will be able to
  graph functions.
• Standard 4MG2.1 - Students will draw the points
  corresponding to linear relationships on graph
  paper (e.g., draw 10 points on the graph of the
  equation y 3x and connect them by using a
  straight line.

3
Introduce
Input (x) Bags Output (y) (x, y)
1 5 (1, 5)
2 10 (2, 10)
3 15 (3, 15)
4 20 (4, 20)

• Andrew went apple picking with our class. Each
  bag can hold 5 apples.

• What does this function table show?
• What is the rule?
• How can you write the rule as an equation?
• Where do you think the values in the ordered
  pairs in the last column came from?

4
Teach
Input (x) Bags Output (y)
Number of As Money Earned
1 2
2 4
3 6
4 8

• Soumyas parents gave her 2 for every A she
  earns on her report card. The function table
  shows how much Soumya will earn if she gets 1, 2,
  3, or 4 As.

How could we write this pattern as a rule?
y 2x
5
Graph a Function

• Before we graph Soumyas function, lets watch
  this concept in motion.
• Graph the function!!
• Graph the function y 2x. Then use the graph to
  find out how much Soumya will get if she earns 6
  As.

Rule y 2x.
Input (x) Number of As Output (y) Money Earned Ordered Pair
1 2 (1, 2)
2 4 (2, 4)
3 6 (3, 6)
4 8 (4, 8)
6
Come on Mrs. Verughese!!

• Mrs. Verughese!!

7
Bales Bucks!!
8
Assignment

• Page 492 - s 6 - 12
• Get them all correct - No Math Homework