Equation of straight line
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Equation of Straight Line. Equation of a straight line (gradient-intercept form) : y = m x + c where m is the gradient and c is the y-intercept . Equation of a straight line (given gradient and 1 point) :. Finding equations. Find the equation of the straight line joining

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Equation of Straight Line

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Equation of straight line

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):


Finding equations

Finding equations

Find the equation of the straight line joining

(2, 4) and (–2, 3)(–2, – 4) and (1, –7)


Finding equations1

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)


Finding equations2

Finding Equations

  • What is the equation of the line which has gradient 2 and which passes through the origin?


Finding equations3

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).


Finding equations4

Finding Equations

Find the values of k if the line

is parallel to


Finding equations5

Finding Equations

Given the line, find

  • its gradient;

  • the coordinates of the point at which it cuts the x-axis.


Straight line equations of different forms

Double-intercept form

General form

Gradient-intercept form

*Given gradient and 1 point

Straight line equations of different forms


Collinear points

Collinear Points

3 points are collinear if gradient AB = gradient BC


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