Page 5 - Grab Me SPM Add Mathematics Form 4,5

2
Example 1 Example 2
Determine whether the following relations is a Determine whether the following graphs represents
function or not. Give your justification. a function or not. Give your justification.
(a) a • • 1 (a) y (b) y
➤ ➤
b • ➤ • 2
c • • 3
0 x
(b) {(1, 2), (2, 3), (2, 4), (3, 5)} 0 x
(c) y
3 Solution y
2 ©PAN ASIA PUBLICATIONS
(a) No. The vertical line cuts
1 the graph at more than one
0 x point. 0 x
1 2 3
Solution y
(a) A function. Every object has only one image,
that is, {(a, 2), (b, 2), (c, 1)}. (b) Yes. The vertical line cuts
(b) Not a function. Object 2 has two images. the graph at one point only.
(c) A function. Every object has only one image. 0 x

Ch 1_Grab Me SPM AddMaths F4.indd 2 13/05/2022 8:56 AM