Question

i need help trying to figure this problem out. Anyone care to help?

Answer 1

I will try to help you.

Answer 2

i will try to help you

Answer 3

Write the appropriate joint-variation equation and find y for the given values of x and z. Y=-315 when x=5 and z=9; x=-7 and z=8.

Answer 4

what is the actually problem or is that it?

Answer 5

That's it.

Answer 6

Joint-variation means the form of y = kx. In this case you have a z, too, so y = kxz. From there, you need to solve for k.

Answer 7

So, do I just plug in x and y then how to I solve for k?

Answer 8

Yeah, for the first part, you plug in y, z, and z, and it'll help you get k. Once you get k, the value of k NEVER changes, so it'll be used to help you solve for y in the second part. So for the first one, you would have -315 = k(5)(9)

Answer 9

Ok, then do I have divide -315 by 45?

Answer 10

yep

Answer 11

So, K=-7 ... then what?

Answer 12

Now you use the other two values for x and z, and your new k, and use those to find y.

Answer 13

So just multiply? -7, 8, and -7?

Answer 14

That's all ya gotta do.

Answer 15

Thank you so much!

Answer 16

Yep, np ^_^