Question

If y is directly proportional to x squared and y = 3 when x = 2, what is y when x = 8?

Answer 1

Answer:

y = 63

Step-by-step explanation:

y is directly proportional to x²

As given,

when y = 3 => x = 2

So, 3 = 4 - 1

Which means the relation can be written as :-

y = x² - 1

Substituting x = 8

y = (8)² - 1

y = 64 - 1

y = 63

Answer 2

Answer:

Y=48

Step-by-step explanation:

Y= kx^2

3= k x 2^2

3 = k x 4

÷4

3/4 = k

Y=kx^2

Y= 3/4 x 8^2

Y= 3/4 x 64

Y=48

Hope this helps!