• Improve Tuition
• Improve Tuition
• Improve Tuition
• Improve Tuition
• Improve Tuition

# Learner Guide

Maths

Page:   1 | 2 | 3                                                                 < >

Straight line graphs

Plotting straight line graphs: Method 1

L. O –  To be able to draw straight lines given their equation.

We can draw straight line graphs by plotting a few points.Choose 3 values of

x and work out (using the equation of the line) the corresponding y values.

You can write these in a table. Plot these 3 coordinates and draw the line!

Example

Draw the line: y=3x +5.

Choose 3 x values; x=-2, x=2 and x=6.

Find the corresponding y values:

When x=-2   y=3(-2) +5   y=-6+5   y=-1

When x=2    y=3(2) +5    y=6+5    y=11

When x=6    y=3(6) +5    y=18+5  y=23

1. Insert the x and y values into a table.

 x -2 2 6 y -1 11 23

 Steps   1. Choose three x values.  2. Find the corresponding y values using the equation given ( by putting         into the equation the value of x).  3. Draw up a table and insert the x and y values you have worked out             above.  4. Plot the three points on a graph.  5. Join the points together to form a straight line.

2. Plot the points.

3. Draw the line.

Page:   1 | 2 | 3                                                             Next >

Related Topics

Graphs-of-quadratic-functions

Check the box if you are a member of Improve Tuition
Email me more information and special offers