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y varies directly as x so y = cx for some constant c.

y = 125 when x = 25 so 125 = c*25 so that c = 5

ie the relationship is y = 5x

Then when x = 2,

y = c*x = 5*2 = 10

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Q: Given y varies directly as x and y equals 125 when x equals 25what is the value of y when x equals 2?
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