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 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

Find the equation of the straight line joining

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


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 Equations

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


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 Equations

Find the values of k if the line

is parallel to


Finding Equations

Given the line, find

  • its gradient;

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


Double-intercept form

General form

Gradient-intercept form

*Given gradient and 1 point

Straight line equations of different forms


Collinear Points

3 points are collinear if gradient AB = gradient BC


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