You sign up for karate classes. the classes cost $80dollar sign, 80 per month. write an equation for the number of dollars, d, that you pay for your karate classes if you take classes for m months.

you pay $80 for signing up, no matter how many months classes you attend. however, your total cost from classes will depend on how many months you go to classes for

knowing this we can write the equation:

c = 80m +80

if you was gonna solve for a, a is a   < -12