Question

Y

Answer 1

Answer:

y = 75

Step-by-step explanation:

Given that:

   y $\alpha$ $\sqrt{x}$

⇒ y = k$\sqrt{x}$

where k is the constant of proportionality.

When y = 45, x = 81, then;

45 = k$\sqrt{81}$

45 = 9 k

k = $\frac{45}{9}$

  = 5

k = 5

So that,

y = 5$\sqrt{x}$

the value of y when x = 225 is;

y = 5$\sqrt{x}$

  = 5 x $\sqrt{225}$

  = 5 x 15

y = 75