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21.
Draw a graph for the following.

Is it a linear graph?

Taking the side of the square along the x-axis and the perimeter along the y-axis and plotting the points (2, 8), (3, 12), (3.5, 14), (5, 20) and (6, 24), we get the required graph as a straight line.
∴ This graph is a linear graph.

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22. Draw a graph for the following:

Is it a linear graph?

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23.

Plot the point (4, 3) on a graph sheet. Is it the same as the point (3, 4)?

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24.

Choose the letter(s) that indicate the location of the points given below:
(i) (2,1) (ii) (0,5) (iii) (2,0)
Also write the co-ordinates of: (iv) A (v) F

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25. Plot the following points and verify if they lie on a line. If they lie on a line, name it.
(i) (0, 2); (0, 5); (0, 6); (0, 3.5)
(ii) A (1, 1) ; B (1, 2); C (1, 3); D (1, 4).
(iii) K (1, 3); L (2, 3); M (3, 3); N (4, 3)
(iv) W (2, 6);X (3, 5); Y (5, 3); Z (6, 2)

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26.

A bank gives 10% simple interest (S.I.) on deposits by senior citizens. Draw a graph to show the relation between the sum deposited and simple interest earned. Find from your graph.
(i) The annual interest for an investment of Rs 250.
(ii) The investment one has to make to get an annual simple interest of Rs 70.

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