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Assume y varies directly as x if y = 7 when x=3 find x when y=21

Assume y varies directly as x if y = 7 when x=3 find x when y=21
asked 104k views
4 votes
Assume y varies directly as x if y = 7 when x=3 find x when y=21

asked
User Reid Spencer
by
8.7k points

1 Answer

4 votes

Answer:

x=9 when y=21

Explanation:

I used cross multiplication

7:3=21:x

7x=63

x=9

answered
User Dezzley
by
8.5k points
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