how many solutions does each system of equation have?? explain how you know without solving the system ​

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

Select the correct answer from each drop-down menu. a system of equations and its solution are given below. system a complete the sentences to explain what steps were followed to obtain the system of equations below. system b to get system b, the equation in system a was replaced by the sum of that equation and times the equation. the solution to system b the same as the solution to system a.]

Can someone explain to me how to do