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3 years ago

If y is directly proportional to x and y = 17.5 when x=21 find y when x=39

Mathematics

2 answers:

pychu [463]3 years ago

8 0

21 = 39

—. —

17.5 Y

21y= 682.5

Y=32.5

ANOTHER WAY TO SOLVE IT IS...

Y=kx

17.5=k*21

.833=k

Sooooo

Y=kx

Y=.833*39

Y=32.5

morpeh [17]3 years ago

4 0

direct proportion y=kx , k is constant and k does not equal to 0.

17.5=k(21)

k=5/6

when x =39

y=5/6 ×39

y=32.5

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