Question

Y

∝
√
x
If
y
=
45
when
x
=
81
find,
x
when
y
=
100

Answer 1

9514 1404 393

Answer:

400

Explanation:

The statement of proportionality means the ratio of y to √x is the same. Then we can write ...

(√x)/100 = (√81)/45

√x = 100(√81)/45 = 20 . . . . . multiply by 100

x = 20² = 400

x is 400 when y is 100.