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velikii [3]
3 years ago
8

If y varies directly as x and y=12 when x=c what is y in terms of c when x=8

Mathematics
1 answer:
tatiyna3 years ago
8 0

"y varies directly as x" means y = kx

you do not know what k is yet, other than that it is some constant number.

Now plug in the given values, y=12 when x=4, in the equation

12 = 4k

=> k = 3

Now rewrite the equation with the k value you just found

y = 3k

Substitute 18 in place of x

y = 3(18)

y = 54

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