Ax+by=c
x=2 y=1 2+1=3
2x+y=3.
So for this you'll be just adding the smaller areas together, and seeing if they equal the larger area.

By adding the 2 smaller areas together, we see that they do not equal the larger area.
what does the ^ mean.
i will answer in the comments
A year is 12 months, therefore inserting it into the equation in place of the m, it is 12.25(12) +29.99, which equals 176.99 being less than 180. therefore yes you can buy a 1 year membership