PLEASE HELP I have no idea what I'm doing

Which equation and solution can be used to solve this problem? thirteen less than a number is sixteen. 13-n=16: add 13 to both sides. the answer is 29. n+13=16: subtract 13 from both sides. the answer is 3. n+16=13 subtract 13 from both sides. the answer is 3. n-13=16: add 13 to both sides. the answer is 29.

Select a graph that have an equation with a < 0

How many solutions does the nonlinear system of equations graphed below have? a. one b. zero c. four d. two