Graph Patterns :: A Coordinated Challenge

Level 1 :: Straight line (linear) graphsLevel 2 :: Quadratic graphsMore Graph Activities 1

Can you figure out what equations we used to produce the pattern above? Type your answers below.

You don't have to wait until you have entered all of the equations before you click the Draw Graph button.
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This graph plotting challenge is intended to familiarise students with the equation of a straight line. There are five challenges each with between three and six straight lines in a pattern. In order to proceed to the next challenge the correct equation should be entered into the boxes provided.

The graph of any quadratic is a parabola and the equation can be written in the form:

y = ax2 + bx + c

It is normal to write the terms in descending powers of x. You are encouraged to use the Graph Plotter to investigate how the values of a, b and c affect the shape and position of the graph.

It is probably more convenient to consider the equations in this challenge in the 'completing the square' format:

y = (x + d)2 + e

The Graph Plotter can also be used to investigate how the values of d and e affect the shape and position of this graph. For example the graph shown to the left is the basic parabola with equation:

y = x2

Shifting this graph 3 units to the right gives:

y = (x - 3)2

Shifting the basic parabola 5 units up gives:

y = x2 + 5

Stretching the basic parabola 2 units in the positive y direction gives:

y = 2x2

Related activities

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

The short web address is:

Transum.org/go/?to=straight

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

The short web address is:

Transum.org/go/?to=graphmatch

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

The short web address is:

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.

The short web address is:

Transum.org/go/?to=plotting

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