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advincula

  • 3 years ago

Y is directly proportional to X where Y=81 and X=9 Find Y if X=7 ..... i will wait for the answer . thanks :))

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  1. akkib89
    • 3 years ago
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    y=kx Putting Y=81 and X=9, we get, k=9 Now when x=7 y=7x9=63

  2. akkib89
    • 3 years ago
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    k=constant of proportionality

  3. UnkleRhaukus
    • 3 years ago
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    \[y(x)\propto x\]\[y(x)=kx\] \[y(9)=k\times9=81\]\[\qquad\qquad k=\frac{81}9\] \[y(7)=k\times7=\frac{81}9\times7\color{grey}=\]

  4. jishan
    • 3 years ago
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    |dw:1354623239293:dw|

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