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 Γ— 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 Γ— 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 Γ— 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 βŠ₯ x-axis, meeting the graph at P. 

Clearly, PL, = 200 units. 

Therefore, x = 5 β‡’ S = 200. 

Thus, when x = 5, then S = 200. 

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

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

Clearly, QM = 240 units. 

Therefore, x = 6 β‡’ 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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