22.

The pair of points is on the graph of an inverse variation. Find the missing value.

(2.4, 3) and (5, y)

1 answer

In an inverse variation, the product of the two variables is constant. This means if we have two pairs of points \((x_1, y_1)\) and \((x_2, y_2)\) that satisfy \(xy = k\), where \(k\) is a constant, we can find the missing value.

Given the points \((2.4, 3)\) and \((5, y)\):

  1. First, we can find the constant \(k\) using the first point: \[ k = x_1 \cdot y_1 = 2.4 \cdot 3 = 7.2 \]

  2. Next, we can use this value of \(k\) to find \(y\) using the second point: \[ k = x_2 \cdot y_2 \implies 7.2 = 5 \cdot y \]

  3. Now, solve for \(y\): \[ y = \frac{7.2}{5} = 1.44 \]

Thus, the missing value \(y\) is \(1.44\).

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