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[tex]y[/tex] varies inversely with [tex]x[/tex]. [tex]y[/tex] is 3 when [tex]x[/tex] is 10. What is [tex]y[/tex] when [tex]x[/tex] is 6?

[tex]y = \, ?[/tex]


Sagot :

To solve the given problem, we need to use the concept of inverse variation. When two quantities vary inversely, their product remains constant. In mathematical terms, if [tex]\( y \)[/tex] varies inversely with [tex]\( x \)[/tex], then:

[tex]\[ y \cdot x = k \][/tex]

where [tex]\( k \)[/tex] is a constant.

Given:
[tex]\[ y_1 = 3 \][/tex]
[tex]\[ x_1 = 10 \][/tex]

First, let's determine the constant [tex]\( k \)[/tex]:

[tex]\[ k = y_1 \cdot x_1 \][/tex]
[tex]\[ k = 3 \cdot 10 \][/tex]
[tex]\[ k = 30 \][/tex]

Now, we need to find [tex]\( y_2 \)[/tex] when [tex]\( x_2 = 6 \)[/tex]. According to the inverse variation relationship:

[tex]\[ y_2 \cdot x_2 = k \][/tex]

Substitute [tex]\( k \)[/tex] and [tex]\( x_2 \)[/tex] into the equation:

[tex]\[ y_2 \cdot 6 = 30 \][/tex]

To solve for [tex]\( y_2 \)[/tex], divide both sides of the equation by 6:

[tex]\[ y_2 = \frac{30}{6} \][/tex]
[tex]\[ y_2 = 5 \][/tex]

Thus, the value of [tex]\( y \)[/tex] when [tex]\( x \)[/tex] is 6 is [tex]\( 5 \)[/tex].