This web page is designed to show you how to correctly and quickly use the bubble baby y= function on your TI calculator. Up until this year I have never utilized my calculator to its fullest because I never knew how to use all the different keys. Throughout the year we have probably used this function the most out of any other. There are a few simple steps you have to lean in order to use the Bubble Baby successfully.

• First of all, you have to know the formula for a linear line. If you have the wrong formula it is very hard to get a good fit with your Bubble Baby. The formula is AX+B.
• Then you need to enter in values for the A and B. A good starting number is A=1 and B=0. If you think a different number will be more successful try that instead. Once you enter a value you will be able to see if you are on the right track. Then you can adjust the numbers to fit the curve perfectly.
• Another factor that can make it easier to fit the curve is the window. You want to look at your data you are using and see what the highest and lowest numbers are.
• Below is a sample problem completely worked out.

1. Given the following data set showing the Percent of Homes in the U. S. Heated with Electricity and Oil , answer these questions.

a) Make a Scatter Plot of both Oil and Electricity as a function of the Year.
b) Get an equation for each line.
c) Predict: the percent of homes heating with oil in 1975, heating with electricity in
1990; and heating with oil in 2000.
d) When where the percentages equal?

• After you are given the data you have to get all the lists entered into your calculator. Then you enter in the equation for y =.

• A good starting point is M=1, B=0. Then from there you can see where you need to move you line. M moves the equation up and down and B is the slant. You may have to use decimals to reach you destination.
• After you feel you have a line that fits you can document it by sketching the graph or printing it out.

• Here are some sites that can be very helpful for further references.