Question
If xx and yy vary directly and yy is 40 when xx is 10, find yy when xx is 15.
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GPT 3.5
If xx and yy vary directly, it means they can be represented by a proportional equation of the form yy = k * xx, where k is the constant of variation.
To find the value of k, we can use the information given: yy is 40 when xx is 10.
Substituting these values into the equation, we have 40 = k * 10.
Solving for k, we find k = 4.
Now that we have the value of k, we can use it to find yy when xx is 15.
yy = k * xx = 4 * 15 = 60.
Therefore, when xx is 15, yy is 60.
To find the value of k, we can use the information given: yy is 40 when xx is 10.
Substituting these values into the equation, we have 40 = k * 10.
Solving for k, we find k = 4.
Now that we have the value of k, we can use it to find yy when xx is 15.
yy = k * xx = 4 * 15 = 60.
Therefore, when xx is 15, yy is 60.
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