Page 44 - Mathematics_Form_3

Functions

(c) y y
(b)
5 2
4
1
3
FOR ONLINE READING ONLY
2
-2 -1 0 1 2 x
1
-1
-2 -1 0 1 2 3 4 5 x
-1
-2
-2

(d) y
3 (c) y

2 5
1 4
3
-3 -2 -1 0 1 2 3 x
2
-1
1
-2

-3 -2 -1 0 1 2 3 4 5 x
-1
Solution -2
In order to test whether a function is
one-to-one or not, draw a line parallel (d) y
to the x-axis as shown in the following 3
figures.
2
(a) y
1
3
-3 -2 -1 0 1 2 3 x
2 Mathematics for Secondary Schools
-1
1
-2
-4 -3 -2 -1 0 1 2 3 x
-3
-1
-2
-3
From the figures, it can be observed that
-4
the horizontal lines drawn in (a) and
(b) crosses the graph more than once,

Student\s Book Form Three 37

18/09/2025 09:58:53
MATHEMATIC F3 SB.indd 37 18/09/2025 09:58:53
MATHEMATIC F3 SB.indd 37