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If y varies directly as x and y = 49 when x = 7, what is the value of y when x = 3?

If y varies directly as x and y = 49 when x = 7, what is the value of y when x = 3?
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If y varies directly as x and y = 49 when x = 7, what is the value of y when x = 3?

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User Astrochun
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9.1k points

2 Answers

4 votes
y=21 because 3/21=7 and 7*3=21 so Y=21 
answered
User Chsymann
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8.1k points
5 votes
Direct variation:

y=kx

y=49 when x=7.

49=7k \\ k=(49)/(7) \\ k=7

y=? when x=3.

y=7 * 3 \\ y=21

y=21 when x=3.
answered
User Neglected Sanity
by
9.2k points
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