Gujarat BoardĀ GSEB Textbook Solutions Class 8 Maths Chapter 15 Introduction to Graphs Intex Questions and Answers.

## Gujarat Board Textbook Solutions Class 8 Maths Chapter 15 Introduction to Graphs

Try These (Page 243)

Question 1.

The number of litres of petrol you buy to fill a carās petrol tank will decide the amount you have to pay. Which is the independent variable here? Think about it?

Solution:

Since, quantity of petrol is a need whereas the amount of money is linked with the quantity of petrol.

ā“ Petrol is the independent variable.

Try These (Page 243)

Question 1.

The following table gives the quantity of petrol and its cost?

Plot a graph to show the data.

Use the graph to fInd how much petrol can be purchased for ā¹ 800.

Solution:

We draw axes and take a suitable scale on both the axes. To draw the graph, we take the following steps:

I. Mark the number of litres of petrol along the horizontal axis.

II. Mark the cost of petrol (in rupees) along the y-axis.

III. Now, we plot the given points. i.e..

(10, 500); (15, 750); (20, 1000); (25, 1250)

IV. Join the points.

We find that the graph is a Straight tine.

Yes, we can find the quantity of petrol to be got in ā¹ 800, for this take a point on the y-axis (0, 800). Through B draw AB parallel to x-axis to meet the graph at B. Now from B, draw BC perpendicular to x-axis. As C corresponds to (16, 0).

Thus, 16 litres of petrol can be bought for ā¹ 800.