Question

if y is directly proportional to1/x and x=2 when y=20,what is the value of x when y=1.25

Answer 1

y is directly proportional to 1/x
xy=k (where k is constant)
so,
for x=2 and y=20
k=xy
k=2×20
k=40-(1)
now,
for y=1.25
k=xy
k=x×1.25
k=1.25x-(2)
from equation (1) & (2)
40=1.25x
40/1.25=x
x=32

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Answer 2

Hello!

y=k/x

20=k/2

k=40

1.25*x=k

x=k/1.25

x=40/1.25

x=32

hope helped!