# Graph Plotter :: An Online Graphing Calculator

### Ideas for activities

Can you draw pictures with graphs? Model real life situations by translating them into algebraic equations and by using graphs. Find approximate solutions of simultaneous linear equations using graphs. For example

y = 5x - 7

3x + 2y = 1

Plot families of exponential and reciprocal graphs. For example

y = 2x, y = 3x, y = 4x ...

y = 1÷x, y = 2÷x, y = 3÷x, ...

Reduce a given linear equation in two variables to the standard form y = mx + c; calculate gradients and intercepts of the graphs and then plot them to check.

Solve problems involving direct and inverse proportion using graphical representations. Identify and interpret roots, intercepts and turning points of quadratic functions graphically. Find the equations of the translations and reflections of graphs of given functions. Use graphs to solve optimisation problems. Investigate the absolute value function. Plot families of graphs and describe their characteristics. For example

y = |x2 - 5|

Graph inequalities to solve linear programming problems. more... Plot the graphs of functions and their inverses by interchanging the roles of x and y. Find the relationship between the graph of a function and its inverse. Which functions inverses are also functions?

### Related activities

#### Straight Line Graphs 10 straight line graph challenges for use with computer graph plotting software or a graphical display calculator.

Transum.org/go/?to=straight

#### Graph Match Match the equations with the images of the corresponding graphs. Linear, quadratic and more.

Transum.org/go/?to=graphmatch

#### Human Graphs Students should be encouraged to stand up and make the shapes of the graphs with their arms.

Transum.org/go/?to=humangraphs

#### Plotting Graphs Complete a table of values then plot the corresponding points to create a linear, quadratic or reciprocal graph.

Transum.org/go/?to=plotting

The Batman Equation - Turn Anything into a Graph - Sen Zen

Tuesday, October 24, 2017

Tom Lucas, Bristol

Wednesday, February 21, 2018

"It would be nice to be able to draw lines between the table points in the Graph Plotter rather than just the points."

Emmitt, Wesley College

Monday, July 22, 2019

"Would be great if we could adjust the graph via grabbing it and placing it where we want too. thus adjusting the coordinates and the equation."

Thursday, September 19, 2019

"Thank you very much for this program. It is excellent."

João Ricardo Oliveira, Brazil

Wednesday, April 22, 2020

"First of all, congratulations for the beautiful job! But I have a question: is there a way to save/download the graphics?

[Transum: Try doing a screen grab or, if you use Windows, use the Snipping Tool]"

Alistair, UK

Monday, October 12, 2020

"Absoultely brilliant got my kids really engaged with graphs. Unfortunately it only plots the positive answer to the square root so the circles would not plot.

[Transum: Glad to hear they were so engaged. Yes the positive square root is the default. Try plotting the circle with the equation in the form x2 + y2 = 52 see here]"

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