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Question

Observe the following tables and find if x and y are directly proportional:
x5812151820
y1524366072100

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Solution

1/It is given that,
x/y=5/15=1/3
Similarly,
x/y=8/24=1/3
x/y=12/36=1/3
But, x/y=15/60=1/4
x/y=18/72=1/4
x/y=20/100=1/5 which is not equal to 1/3
So, x/y is not constant.
Hence, x and y are not directly proportional.

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