25
290
3
y=(320 x 25 )/ 40 = 200.
xy = K so K = 21
50
80
290
3
y is 12
The statement "y varies inversely as the square of x" means that in function form y(x) = k/x2, where k is an (initially) unknown constant. The second condition can be written in algebraic form as 4 = k/32 ; or k = 4 X 9 = 36; Then y(2) = 36/22 = 9.
1
x = 24
m = 24
y=(320 x 25 )/ 40 = 200.
-6/y=5/-2 5y=12 y=12/5
xy = is a constant (k) so k = -360. When y = - 36, x = 10
xy = K so K = 21