Question

Y

∝
√
x
If
y
=
56
when
x
=
49
find,
x
when
y
=
72

Answer 1

x = 81

Explanation:

y = k√x

56 = k√49

56 = k(7)

Divide both sides by 7

8 = k

k = 8

------------------------

When y = 72

72 = 8√x

Divide both sides by 8

9 = √x

Square both sides

81 = x

x = 81