00:01
Okay, we are told that y varies directly as x, so y is proportional to x, as direct variation.
00:10
And we are told y varies inversely, so 1 over the square of z.
00:18
So we have y proportional, so 1 over z squared.
00:23
Which combined means y proportional to x over z squared.
00:31
And that implies that y is equal to k x over z squared.
00:40
So to go from proportion to equals, just put k there.
00:46
Then we are told, well, next step is to find the value of k.
00:51
So to do that, i need some values.
00:53
And i'm told that y is 27.
01:00
So 27 equals k when x is 75 and z is 5...