Question 1077660
y=kx, where y is spring stretching in cm and x is weight in kg
12=8k
k=1.5
use that in next part
y=1.5*11=16.5cm.
42=1.5*x
x=28 kg
it makes sense there is direct variation, because increased weight causes increased stretch.  The only concern one might have is whether it is exponential, but it is not.