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kiruha [24]
3 years ago
12

If y varies directly as x, and y is 6 when x is 72, what is the value of y when x is 8?

Mathematics
2 answers:
Veseljchak [2.6K]3 years ago
8 0

The correct answer is: y = \frac{2}{3}

Explanation:

The direct relation can be written as follows:

y \propto x

Now to remove the proportional sign, we use the constant of proportionality, let's say <em>k</em>, as follows:

y = kx

When y = 6, x = 72, <em>k </em>will be:

k =\frac{y}{x} \\ k =\frac{6}{72} =  \frac{1}{12}


Now we know the value of <em>k, </em>let's find the value of y when x = 8:

y = kx \\ y =\frac{1}{12} * 8 =\frac{2}{3}

Hence the correct answer is: y = \frac{2}{3}

goldfiish [28.3K]3 years ago
8 0
X÷y=72÷6=12    8÷12=2/3 y would equal 2/3
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