Note to recorder:
Natural speed, serious tone
Write down the coodinates of the point where the following pairs of lines cross.
Find the coordinates of at least two points for which the y value is the same as the x value.
These diagonal lines occur frequently so it is useful to be able to draw them from memory.
To find the midpoint of a line segment you should add the x-coordinates and divide by two, and add the y-coordinates and divide by two.
The gradient of a straight line is a measure of its slope.
Steeper lines have larger gradients.
