From previous activities, we know that we can recognise the equation of a straight line graph.

It is in the form: ** y = mx + c **

Where **m** is the gradient (steepness) of the line

and **c** is the y-intercept (where the line crosses the y axis)

__Parallel Lines__

In order for a line to be parallel to another then the steepness (gradient)** must **be the same.

The y-intercept does not matter in this case.

You can see from the lines here that they are parallel as they have the same gradient.

This activity is about recognising lines that are parallel to each other.

__Example__

Which of these lines are parallel?

** y = 4x - 3 y - 4x = 7 y = 2x - 3**

__Answer__

To be parallel the lines have to have the **same gradient.**

In this case, once they are all in the same form, then the first two have a gradient of 4 so are parallel.

Let's try some questions - remember they all have to be in this form: ** y = mx + c**