Graph of Simple Interest vs. Number of Years

Here we will learn about the graph of simple interest vs. number of years.

Simple interest on a certain sum is $ 40 per year. 

Then, S = 40 × x, where x is the number of years. 

1. Draw a graph of the above function. 

2. From the graph find the value of 5, when 
(a) x = 5        (b) x = 6 

Solution: 

1. The given function is S = 40 × x. 

Putting x = 1, 2, 3, 4 successively and getting the corresponding value of S. we get the table given below. 

      x             1             2             3             4      
    S = 40 × x   
40
80
120
160

Along the x-axis: Take 1 small square = 1 unit. 

Along the y-axis: Take 1 small square = 10 units. 

Now, on a graph paper, plot the points 

A (1, 40), B (2, 80), C (3, 120) and D (4, 160). 

Join them successively to get the required graph line, shown below.

Graph of Simple Interest vs. Number of Years

2. Reading off from the graph of simple interest vs. number of years:

(a) On the x-axis, take the point L at x = 5. 

Draw LP ⊥ x-axis, meeting the graph at P. 

Clearly, PL, = 200 units. 

Therefore, x = 5 ⇒ S = 200. 

Thus, when x = 5, then S = 200. 

(b) On the x-axis, take the point M at x = 6. 

Draw QM ⊥ x-axis, meeting the graph at Q. 

Clearly, QM = 240 units. 

Therefore, x = 6 ⇒ S = 240. 

Thus, when x = 6, then S = 240. 

Related Concepts:

Coordinate Graph

Ordered pair of a Coordinate System

Plot Ordered Pairs

Coordinates of a Point

All Four Quadrants

Signs of Coordinates

Find the Coordinates of a Point

Coordinates of a Point in a Plane

Plot Points on Co-ordinate Graph

Graph of Linear Equation

Simultaneous Equations Graphically

Graphs of Simple Function

Graph of Perimeter vs. Length of the Side of a Square

Graph of Area vs. Side of a Square

Graph of Distance vs. Time









7th Grade Math Problems

8th Grade Math Practice

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