I need to know the answers,, we haven’t yet learn this but it is a quiz grade

If (a, b) is the solution to the system of equations shown above, and a and b are integers, then what is the value of a+b?

Assessment includes a. interviews, recorded conversations, videos, frequency counts, and time samples. b. formal standardized tests and developmental screening tools. c. various types of documented observations, documentation of child work, checklists, rating scales, and standardized tests. d. anecdotal notes, narratives or daily records, daily health checks, and teacher observation checklists.

Give an example of the type and scale of economic activity for a traditional economy.