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प्रश्न
The cost of a note book is Rs 10. Draw a graph after making a table showing cost of 2, 3, 4, .... note books. Use it to find
- the cost of 7 notebooks.
- the number of note books that can be purchased with Rs 50.
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उत्तर
Let x: number of notebooks
y: cost of a notebook
| x | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 |
| y | 10 | 20 | 30 | 40 | 50 | 60 | 70 | 80 |
a. The cost of 7 notebooks is aqua to the ordinate of the point (7, 70), i.e. cost of 7 notebooks = Rs 70
b. The number of notebooks that can be purchased with Rs 50 is equal to the abscissa of the point (5, 50).
Hence, 5 notebooks can be purchased with Rs 50.
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