Chapter 3: Pair of Linear Equations in Two Variables

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Q
Pair of linear equations in two variables CBSE NCERT Solutions

Question:

The coach of a cricket team buys 3 bats and 6 balls for Rs 3900. Later, she buys another bat and 3 more balls of the same kind for Rs 1300. Represent this situation algebraically and graphically.

Answer:

Solution: Suppose the cost of 1 cricket bat is Rs x and the cost of 1 cricket ball is Rs y.

According to given conditions, we have

  3x + 6y = 3900 \Rightarrow x + 2y = 1300 ... (I)

And x + 3y = 1300 (II)

x

0

1300

y

650

0

 

 

 

 

For equation x + 2y = 1300, we have the following points which lie on the line.

 

x

0

1300

y

\frac{1300}{3}

0

 

 

 

 

 

 

For equation x + 3y = 1300, we have the following points which lie on the line.

 

We plot the points for both of the equations x + 2y = 1300 & x + 3y = 1300. The following is the graphical representation of the given situation.

 

These two lines intersect at B (1300,0).

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