Here we will learn about the graphs of simple functions that is multiples of different numbers.
The example will help us to understand the graph of multiples of different numbers.
1. Draw the graph of the function y = 3x.
2. From the graph, find the value of y, when
(a) x = 4
(b) x = 5
Solution:
1. The given function is y = 3x.
For some different values of x, the
corresponding values of y are given below.
x  0  1  2  3 


On a graph paper plot
the points O (0, 0), A (1, 3), B (2, 6) and C (3, 9) and join them successively
to obtain the required graph.
2. Reading off from the graph of simple function:
(a) On the xaxis, take the point L at x = 4.
Draw LP ⊥ xaxis, meeting the graph at P.
Clearly, PL = 12 units.
Therefore, x = 4 ⇒ y = 12.
(b) On the xaxis, take the point M at x = 5.
Draw MQ ⊥ xaxis, meeting the graph at Q.
Clearly MQ = 15 units
Therefore, x = 5 ⇒ y = 15
Related Concepts:
● Ordered pair of a Coordinate System
● Find the Coordinates of a Point
● Coordinates of a Point in a Plane
● Plot Points on Coordinate Graph
● Simultaneous Equations Graphically
● Graph of Perimeter vs. Length of the Side of a Square
● Graph of Area vs. Side of a Square
● Graph of Simple Interest vs. Number of Years
7th Grade Math Problems
8th Grade Math Practice
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