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Illusion [34]
3 years ago
5

If x varies directly with y and x=6 when y=8, find x when y=18.

Mathematics
1 answer:
andrey2020 [161]3 years ago
6 0

Answer:

x = 13.5

Step-by-step explanation:

direct variation

y = kx

substitute x and y to find k

8 = k*6

divide by 6

8/6 =k

4/3 = k

y = 4/3 x

now put in y =18

18 = 4/3 x

 multiply by 3/4

18 * 3/4 = 3/4 * 4/3 x

54/4 = x

change to a decimal

13.5 =x


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