WARM UP

1) Graph the lines x = -4 and y = 2 on the same coordinate plane & label.

2) At the football game hotdogs cost $2 and sodas cost $1.50 and you have $12 to spend.

a) Write an equation in standard form. Label your variables.

b) What is one combination of hotdogs and sodas that you could buy with $12?

LINES OF BEST FIT

GUESS MY AGE!On the following slides you will see photos of

10 famous people.

Guess the celebrities age and write it on your worksheet.

At the end you will be given the correct data and will use it all to create a line of best fit.

TAYLOR LAUGHTNER MILEY CYRUS

PRESIDENT OBAMA LADY GAGA

KIM KARDASHIAN NICK JONAS

JUSTIN BIEBER JENNIFER LOPEZ

ASHTON KUTCHER JENNIFER ANISTON

HERE ARE THE CORRECT AGES….FILL IN ON YOUR WORKSHEET!

Taylor Laughtner 21Miley Cyrus 20President Obama 52Lady Gaga 27Kim Kardashian 33Nick Jonas 21Justin Bieber 19Jennifer Lopez 44Ashton Kutcher 35Jennifer Aniston 44

Use your data to answer questions 1 – 11 on your

worksheet.

STEPS TO CREATING A LINE OF BEST FIT

1. Plot all ordered pairs to create a scatter plot

2. Find two points that you think would be on the best fit line.

3. Find the slope & y-intercept of that line and write the equation of the line.

SO WHO HAS THE REAL "LINE-OF-BEST-FIT"?

Based on your guesses for the celebrities ages and your choice of two points, everyone probably has a different equation for the line of best fit.

Your answer will be considered CORRECT, as long as your calculations are correct for the two points that you chose. So, if each answer may be slightly different, which answer is the REAL "line-of-best-fit?

To answer this question, we need the assistance of a graphing calculator.

COMING UP…

HW tonight 4.10

Possible Quiz 4.2 early next week

Unit 4 Test – next Friday 11/1