4x+8y=40
0.8*8=6.4
4x+6.4=40
40-6.4=33.6
4x=33.6
33.6\4=8.4
X=8.4
We will have to use proportions:

Cross multiplying we get

Now divide:

Solve to tenths place we get

The woman casts a 36.6 ft long shadow.
Answer:
m = 4
you can find the answer for this on m a t h w a y (without the spaces)
I hope this helps!
If you're looking for the gradient then it will be y=4x otherwise please write the question!