Step 1: Replace

in the second equation with the right side of first equation like that:

Step 2: Solve that simple equation:




Step 3: Replace

of first equation with found value and solve it:


So, the solution is:

and

.
Red fabric has a different unit cost to the others
I would choose to have a higher initial rate of zombies with a slower growth rate because (although it would be difficult in the beginning) i would have more time to prepare for the zombies.
Answer:
1 ans A second phi okay yed