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Mathematics : Linear Equations in Two Variables

Short Answer Type

211. The cost of a notebook in a book-shop is र 15. Form a linear equation with x-representing the number of notebooks and y-representing the total cost (in र) and draw its graph. From the graph, find the total cost if 5 notebooks are purchased.

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212. Water is flowing into a water tank at the rate of 10 cm³/sec. If the volume of water collected in t seconds is V cm³, write a linear equation to represent the above statement. Draw a graph of the linear equation.

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213. Write

square root of 7 y equals 2 x

as a linear equation of the form ax + by + c = 0. Also write the values corresponding to a, b, c. Does the graph of this linear equation pass through origin? Give your answer in yes or no.

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214. The cost of a toy telephone is the same as cost . of 4 balls. Express this statement as a linear equation in two variables. Also, find the cost of getting 2 toy telephone packed, if cost of 1 ball is र 5 and there is a fixed cost of र 2 for packing a toy telephone.

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