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macwaters
11.07.2019 •
Mathematics
How do i write a direct variation given that y varies directly with xx: 15 y: -5
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Ответ:
More generally, though, you'll have something of the form y = kx, where the variable k here is referred to as the constant of proportionality. Another way you can think of k is as the ratio of y to x.
In this problem, you're given a set of values for x and y, and you'll need to use those to find the constant of proportionality before you set up an equation relating x to y. Substituting our general equation y = kx for the given values, we have:
-5 = k(15)
To get k, simply divide both sides by 15 to obtain:
k = -5/15 = -1/3
So, our general equation, for any x, would be y = (-1/3)x
Ответ:
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