1. Equation of Straight Line
Equation of a straight line (gradient-intercept form):
y = mx + c where m is the gradient and c is the y-intercept.
Equation of a straight line (given gradient and 1 point):

2. Finding equations Find the equation of the straight line joining
(2, 4) and (–2, 3) (–2, – 4) and (1, –7)

3. Finding equations Find the equation of the lines, given the
gradient and the coordinate of a point lying
on the line.
(a) m = 3, (1, 1) (b) m = 0.5, (5, 7)

4. Finding Equations
What is the equation of the line which has gradient 2 and which passes through the origin?

5. Finding Equations
Find the equation of the straight line that is parallel to and bisects the line segment joining the points (3, 1) and
(1, –5).

6. Finding Equations
Find the values of k if the line
is parallel to

7. Finding Equations Given the line, find its gradient;
the coordinates of the point at which it cuts the x-axis.

8. Straight line equations of different forms
Gradient-intercept form
*Given gradient and 1 point
Double-intercept form
General form

9. Collinear Points
3 points are collinear if gradient AB = gradient BC