Grade 9
Mathematics
y=x-4
Unit 20
Graphs
Reading material
L.K. AMARAKOON
R/SIVALI CENTRAL COLLEGE
,Grade9 Mathematics Graph
By studying this lesion you will be able to…
identify this functions
draw graphs of functions of the form and and identify
their characteristics.
identity the gradient and intercept of a straight line graphs,
plot straight line graphs of equations of the form
identify the relationship between the gradients of straight lines which are parallel
to each other.
, Grade9 Mathematics Graphs
Straight line graphs
Let’s draw a coordinate plane with x and y axes and mark following points. Then join
those points and obtain a straight line.
i) (-2,3) , (0,3) , (2,3), (5,3) x
Equation of the straight line: x x x x
x
x
ii) (4,-4) , (4,0) , (4,2), (4,5)
Equation of the straight line;
x
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