Question

If y varies directly as x, and y = -18 as x = -2, find y for the x-value of 20.

Answer 1

We can write an equation:
y = kx ..........(1)
where k is a constant of variation.
To find the value of k, plug in the given pair of values for y and x, giving:
-18 = -2k ........(2)
Now you need to solve equation (2) to find the value of k. Having found the value of k, you can then plug the k value and the x value of 20 into equation (1) to find the required y value.

Answer 2

180?

Answer 3

Yes, 180 is correct. Good work!

Answer 4

Thank you

Answer 5

You're welcome :)