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Z varies jointly as x and y. If z=3 when x=3 and y=15, find z when x=6 and y=9.


Sagot :

Answer:

The value of z when x = 6 and y = 9 is  [tex]\boxed{\frac{18}{5}}[/tex]  or  [tex]\boxed{3\frac{3}{5}}[/tex].

Step-by-step explanation:

Mathematical Sentence:

[tex]z=xyk[/tex]

Solution for the constant of variation or k:

Given:   [tex]z=3[/tex],   [tex]x=3[/tex],   [tex]y=15[/tex]

Find:   [tex]k=?[/tex]

Formula:   [tex]z=xyk[/tex]

Solution:

[tex]z=xyk\\3=(3)(15)k\\\frac{3}{(3)(15)}=\frac{(3)(15)k}{(3)(15)}\\k=\frac{1}{15}[/tex]

Final solution for z:

Given:   [tex]k=\frac{1}{15}[/tex],   [tex]x=6[/tex],   [tex]y=9[/tex]

Find:   [tex]z=?[/tex]

Formula:   [tex]z=xyk[/tex]

Solution:

[tex]z=xyk\\z=(6)(9)(\frac{1}{15})\\z=(2)(9)(\frac{1}{5})\\z=(18)(\frac{1}{5})\\\boxed{z=\frac{18}{5}\:\:or\:\:3\frac{3}{5}}[/tex]

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