Geometer's Sketchpad has been discontinued. Use Geogebra, instead.
Algebra 1 & 2 Students:
Watch the first 5 minutes of this How-To video: Instructional Video
Use either the online version or the free apps for iOS and Android devices called, Geogebra Graphing Calculator.
Precalculus & Calculus Students:
Watch all of this How-To video: Instructional Video
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Use either the online version or the free apps for iOS and Android devices called, Geogebra Graphing Calculator.
How to do Linear Regression: (Algebra 1 and higher)
Go to geogebra.org/classic. From the top right menu, select "View". Now select "spreadsheet". Put your values in "x" and "y". Now highlight all the cells.
Look at the top left and find an icon that looks like a histogram. Select it, then choose "Two Variable Regression Analysis". You will see a graph of your points. Under the graph and under "regression model" see the drop-down menu and choose "linear".
You can see the equation under the graph.
Now go back to the top right and find the sigma x (that looks like a funny "E" with an "x" next to it). See the "Statistics" list and find "R^2". That is your answer.
How to do Integrals: (Pre-Calculus and Calculus)
Go to geogebra.org/classic. On the "input" line type the function. Notice that it already says "f(x)=". After entering the function, you will see the graph. On the next line, under the function, start typing "integral". In the drop-down menu, choose "Integral Between"., which is "function, function, start x-value, end x-value". Now type in f(x),start point,end point, each separated by commas but no spaces.
For example 62.3, type the function on the first line. Then on the second line type "f(x),0,10". (Close the parentheses at the end, since there is already a parenthesis at the beginning. Click enter and you see the answer on the graph. and also on the input line. See images below:
IMPORTANT: This app cannot be used when taking the PSAT , SAT , or ACT . You must use an approved calculator. If your student is taking one of these exams this school year, they should use an approved graphing calculator, like the TI-Nspire™ CX II for at least a few months before taking the exam. Learn More
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