Question

(1) Which of the following quantities vary directly with each other?
(i) Number of article (x) and their price (v)
(ii) Weight of article (x) and their pricely)
(iii) Speed is (x) and distance is (y)
(iv) Speed is (x) and time is (y)
(v) Number of labours (x) and time (y)​

Answer 1

Answer:

3) speed and distance will vary.. as speed will increase distance will be shorter.

4) speed and time.. as speed increases time will be less taken

5) no. of laboura are directly proportional to the time.. more worker lesser time and vice versa.

Answer 2

Answer:

Answer:

★ Answer :-

(i) Number of articles (x) and their price (y)

If number of articles is increasing then cost will also increase. So it is a case of direct proportion

(ii) Weight of articles (x) and their cost (y).

When weight of the article is increasing then cost also increase. So it is a case of direct proportion

(iii) Distance x and time y, speed remaining the same.

Time increases when distance increases, if speed remains constant. So it is a case of direct proportion

(iv) Wages (y) and number of hours (x) of work.

Wages increases if the number of working hours increases. So it is a case of direct proportion

(v) Speed (x) and time (y) distance covered remaining the same).

For same distance time taken will reduce if speed is increased. So it is not a case of direct proportion

(vi) Area of a land (x) and its cost (y).

Cost of the land increases if its area increases. So it is a case of direct proportion

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