Question

Find the value of y for a given value of x, if y varies directly with x.

If y = 61 when x = –305, what is y when x = –315?

Answer 1

If y varies directly with x, that basically means that
y = Kx,
where K is some constant.

So if y = 61 and x=-305
61 = K(-305)
K = ___

So, when x = -315,
y = (K)(-315)
y = ___

Answer 2

so multiply -315 by 61? i did that but it wasnt one of the answers

Answer 3

a.
–63
b.
63
c.
1575
d.
–1575

Answer 4

The answer is there. I also explained in detail how to go about this problem.

Answer 5

i dont understand what k is though. how do i figure out k?

Answer 6

If you have: y = Kx, how would you go about solving for "K". Using algebra?

Answer 7

Rearrange it

Answer 8

dividing y by x?

Answer 9

Yes.

Answer 10

Now, you have: y/x = K
K = ??

Answer 11

i figured it out, thank you :D