8/13/2019 Form 4 Mathematics Chapter 5

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Chapter 5: The Straight Line

Gradient of a Straight Line

Gradient =

Gradient = tan

Gradient =21

21

Intercept

Intercept: The point where the straight line cuts across the axis

x-intercept: The value of x when the straight line cuts across the x-axis

y-intercept: The value of y when the straight line cuts across the y-axis

Gradient = -

Form 4 Mathematics

Chapter 5: The Straight Line

Vertical Distance

Horizontal Distance

y1

y2

x1 x2

y-intercept

x-intercept

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Equation of A Straight Line

y = mx + c, m = gradient, c = y-intercept

ax + by = c

Point of intersection of two straight lines is the point which satisfies the both

straight lines.

Parallel Lines

Two parallel lines have the same gradient (m1= m2)

Form 4 Mathematics

Chapter 5: The Straight Line

line 1 line 2

m1m2

point of intersection

line 1line 2