Question

Y

Answer 1

Answer:

y = 18 when x = 3

Step-by-step explanation:

y is directly proportional to x^2, meaning:

$y=ax^2$

where a is the proportion between them. We're given the values for both x and y, so plug those in and solve for a:

$8=a(2)^2\\8=a4\\2=a\\a=2$

Now you can use a to solve for y when x is 3:

$y=ax^2\\y=(2)(3)^2\\y=2(9)\\y=18$