When the sum of 9 and a certain number is divide by 2 the result is equal to five times the original number minus 3 what ii the number?

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.

Anyone know? will mark brainliest if correct

Complete the solution of the equation. find the value of y when x equals to 6 4x+y=20