Question

The value of y varies directly with x2, and y = 150 when x = 5.



What is the value of y when x = 3?

Answer 1

y varies directly with u means y=ku
your u is x^2

Answer 2

you can find the constant k by using the point (5,150)

Answer 3

let me know if you need more help on this one

Answer 4

please help

Answer 5

on which part?

Answer 6

can you show me what you have so far?

Answer 7

so I already said y=kx^2
and you are saying you don't know how to replace x with 5 and y with 150?

Answer 8

you replace the y with 150 and x with 5 like this
y=kx^2
150=k(5)^2
solve for the constant k