Question

x varies inversely with y and if y=10 and x=2, then y=4, x=?​

Answer 1

Answer:

5

Step-by-step explanation:

using formula x1y1 = x2y2,

therefore 10*2 = 4*x2,

20 = 4x2,

20/4 = x2,

5 = x2

Answer 2

Answer:

it is given that x varies inversly as I. e

x alpha 1/y

Step-by-step explanation:

. : x=k/y, where k is constant of variation

=X×y= k

when x= 2,y= 10

here k = 2×10= 20

so the equation of variation is xy=20

when y = 4,

4x=20

x =20/4

x=5