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If y varies directly as the square of x, and y is 100 when x is 10, find y when x = 12. ​

Sagot :

[tex]\color{lime}\underline\mathbb{QUESTION:}[/tex]

If y varies directly as the square of x, and y is 100 when x is 10, find y when x = 12.

[tex]\\[/tex]

Translation: (Direct variation)

y varies directly as the square of x

  • y = kx²

-------------------------------

  • y = 100, x = 10
  • y = kx²
  • 100 = 10²k
  • 100 = 100k
  • 100/100 = k
  • 1 = k

----------------------------

  • y = ?, x = 12
  • y = 1x²
  • y = 1 · 12²
  • y = 1 · 144
  • y = 144

[tex]\\[/tex]

[tex]\color{yellow}\underline\mathbb{ANSWER:}[/tex]

  • The value of y is 144.

[tex]\huge\huge\color{orange}{\boxed{\tt{y \: = \: 144}}}[/tex]

[tex]\huge\tt\color{yellow}{SOLUTION:}[/tex]

  • [tex] \large\tt\color{lime}\underline{y = kx²}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = 100, x = 10}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = kx²}[/tex]
  • [tex] \large\tt\color{lime}\underline{100 = 10²k}[/tex]
  • [tex] \large\tt\color{lime}\underline{100 = 100k}[/tex]
  • [tex] \large\tt\color{lime}\underline{1 = k}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = ?, x = 12}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = 1x²}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = 1 · 12²}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = 1 · 144}[/tex]
  • [tex] \large\tt\color{lime}\underline{y = 144}[/tex]