if x varies inversely as y and x is equal to 10 then Y is equal to 8
then find Y when x is equal to 4
Answers
Answered by
6
X inversely to y
y=k×1/x
xy=k.........(1)
x=10 & y=8
substitute in eqn (1)
10×8=k
80=k
when x=9 put eqn value of k and x
8×y=80
y=80/8
y=10
y=k×1/x
xy=k.........(1)
x=10 & y=8
substitute in eqn (1)
10×8=k
80=k
when x=9 put eqn value of k and x
8×y=80
y=80/8
y=10
Answered by
4
Answer:
x1= 10 y1=8
x2= 4 y2=?
x1:x2::y2:y1
10:4::y:8
10/4=y:8
4y= 80
y=80/4
y=20
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