Question

The value of y varies directly as x, and y is 2 when x is 10. What is the value of y when x is -25?

Answer 1

y varies directly as x

that means you can write a formula

y = k x
where k is some number (which you have to find)

Answer 2

to find "k"
use this info: y is 2 when x is 10.
in
y = k*x
and "solve for k"
can you do that ?

Answer 3

Yes. I think I got it.