Page 217 - Maths Skills - 8

Introduction to Graphs 215

Tabulating the coordinates, we get The graph will be as shown below:

x 0 1 2 3 4 5
y 0 1 4 9 16 25
Following conclusions are drawn
from the graph:
 the graph is a curve.
 as the length of the side increases,
area of square also increases.

P × R × T
Example 3: The formula for simple interest is given by: S.I. =
100
Where, P = Principal; R = Rate of interest per annum; T = Time in years

Draw the graph of simple interest on ` 100 at the rate of 5% per annum.

Solution: Let the number of years be ‘x’ and simple interest be ‘y’.

According to the formula The graph will be as shown below:

100 5×× x
y =
100
⇒ y = 5x

If x = 1 ⇒ y = 5 × 1 = 5

x = 2 ⇒ y = 5 × 2 = 10

x = 3 ⇒ y = 5 × 3 = 15

x = 4 ⇒ y = 5 × 4 = 20

Tabulating the coordinates, we get

x 1 2 3 4
y 5 10 15 20