The equation is y = 63/x
And y = 3 when x=21
Step-by-step explanation:
When y varies inversely with x, The inverse proportion is given by:
y ∝1/x
When the proportionality symbol is removed, a constant of proportionality is introduced
[tex]y = \frac{k}{x}[/tex]
Putting y = 7 and x = 9
[tex]7 = \frac{k}{9}\\k = 9*7\\k = 63[/tex]
So,
[tex]y = \frac{63}{x}[/tex]
Putting x =21
[tex]y = \frac{63}{21}\\y = 3[/tex]
Hence,
The equation is y = 63/x
And y = 3 when x=21
Keywords: Proportion, variables
Learn more about proportion at:
- brainly.com/question/11220787
- brainly.com/question/11131690
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