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)  
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Finding equations

• Find the equation of the straight line joining
• (2, 4) and (2, 3) (2, 4) and (1, 7)

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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)

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Finding Equations

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

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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).

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Finding Equations

• Find the values of k if the line
• is parallel to

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Finding Equations

• Given the line, find
• its gradient
• the coordinates of the point at which it cuts the
  x-axis.

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Straight line equations of different forms
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Collinear Points
3 points are collinear if gradient AB gradient
BC