I need help to find the angles​

Solve - pv + 40 < 65 for v solve 7w - 3r = 15 for r

If the graphs of the linear equations in a system are parallel, what does that mean about the possible solution(s) of the system? a. there are infinitely many solutions. b. there is no solution. c. there is exactly one solution. d. the lines in a system cannot be parallel.

Acircle has a circumference of 28.36 units what is the diameter of the circle