Felix starts off with 11, so that's our constant.
Each week he saves $5 which is our slope.
Equation for Felix:
Y=5x+11
Eddy has $60 which is our constant
He saves $2 which is our slope
Equation for Eddy:
Y=2x+60
Answer:
-x2+4=-x=4-2=2
-x=2
x= -2