For a given temperature, C degrees on a Centigrade thermometer are equal to F degrees on a Fahrenheit thermometer. The following table gives a series of corresponding values of F and C . C 0 5 10 15 25 40 F 32 41 50 59 77 104 Draw a graph to show the Fahrenheit reading corresponding to a given centigrade temperature and find the Fahrenheit readings corresponding to 35 ° C & 86 ° F .

Given, C 0 5 10 15 25 40 F 32 41 50 59 77 104 To plot a graph of the above data, let us choose the scale first. Along the x - axis : 1 small square = 20 units Along the y - axis : 1 small square = 100 units Now let us plot the given points and join them successively to obtain the required graph. To find the fahrenheit reading corresponding to 35 ° C , we need to draw perpendicular to the x - axis at x = 35 and find the corresponding y value. The value is 95 ° F as seen from the graph. To find the celsius reading corresponding to 86 ° F , we need to draw perpendicular to the y - axis at y = 86 and find the corresponding x value. The value is 30 ° C as seen from the graph.

E M B I B E

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 7

HARD

8th CBSE

IMPORTANT

Earn 100

A train is moving at a constant speed of $75 km / h$ . Draw a distance - time graph. Find from the graph how much distance will the train cover in $3 hours 20 minutes$ .

Important Questions on Introduction to Graphs

HARD

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 7

A train is moving at a constant speed of $75 km / h$ . Draw a distance - time graph. Find from graph how long will the train take to cover a distance of $187.5 km$ .

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 8

Draw a graph to convert $cm$ into $mm$ , given $1 cm = 10 mm$ . Use the graph to find how many $mm$ are equal to $4.7 cm$ .

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 8

Draw a graph to convert $cm$ into $mm$ , given $1 cm = 10 mm$ . Use the graph to find how many $cm$ are equal to $55 mm$ .

MEDIUM

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 9

The graph given along side shows the relation between pounds and kilograms. Find from the graph number of pounds equal to $20$ kilogram. Hence, find how many pounds make a kilogram.

Question Image

EASY

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 9

The graph given below shows the relation between $pounds$ and $kilograms$ .

Question Image

A small girl weighs $22 pounds$ . If her weight is $k kilograms$ , then find the value of $k$ .

EASY

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 9

The graph given alongside shows the relation between pounds and kilograms. Find from the graph.

Question Image

If a bag of rice weighs $15 kg$ , then what is its weight in pounds? (Write only the magnitude in the given box.)

HARD

8th CBSE

IMPORTANT

Number Magic a textbook of Mathematics 8>Chapter 24 - Introduction to Graphs>EXERCISE>Q 10

For a given temperature,

C

degrees on a Centigrade thermometer are equal to

F

degrees on a Fahrenheit thermometer. The following table gives a series of corresponding values of

F

and

C

.

$C$	$0$	$5$	$10$	$15$	$25$	$40$
$F$	$32$	$41$	$50$	$59$	$77$	$104$

Draw a graph to show the Fahrenheit reading corresponding to a given centigrade temperature and find the Fahrenheit readings corresponding to $35 ° C & 86 ° F$ .