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Find an equation of
variation if y varies
directly as x a
nd y = 15
when x = 4.
S​


Sagot :

DIRECT VARIATION

Problem:

» Find an equation of variation if y varies directly as x and y = 15 when x = 4.

Answer:

  • [tex]\bold{}\color{hotpink} \: \bold{y = \frac{15}{4} x } \\ [/tex]

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Solution:

Write the equation of variation first and substitute the given values of x and y to solve for the k or constant of variation.

  • [tex] \: \: \: \tt \: y= kx \\ \: \: \: \: \tt \: 15= k(4) \\ \: \: \: \tt \: \: k = \blue{ \frac{15}{4}} \\ [/tex]

Since, the constant of variation (k) is 3.75 or [tex] \sf \frac{15}{4} [/tex]. Therefore, the equation of variation is:

  • [tex] \underline{ \boxed{ \tt{y= \frac{15}{4} x}}}[/tex]