Straight line graphs
All straight lines take the form of y = mx + c. Where m is the gradient (steepness) and c is the yintercept (cuts the Y axis).
Table of Values
•Use a table for values of ‘x’ to generate coordinates with ‘y’.
•A straight line through these points creates the graph of the equation.
•Use a table for values of ‘x’ to generate coordinates with ‘y’.
•A straight line through these points creates the graph of the equation.
Example 1: Draw the graph of y = 2x  5
Let's use value of x from 1 to 5.
Let's use value of x from 1 to 5.
When x = 1
y = 2 x 1  5 y = 2  5 = 3 
When x = 2
y = 2 x 2  5 y = 4  5 = 1 
When x = 3
y = 2 x 3  5 y = 6  5 = 1 
When x = 4
y = 2 x 4  5 y = 8  5 = 3 
When x = 5
y = 2 x 5  5 y = 10  5 = 5 
If you're still not sure, have a look at this video where I explain the process of how we create the table, work out the yintercept and plot the graph.
Working out the yintercept

Plotting the graph


