Choose the student who correctly used substitution to determine if 19 was a solution to the equation. 6 m = 24. 6 19 = 24. 24 = 24. 19 is a solution. 6 m = 24. 6 19 = 24. 25 not-equals 24. 19 is not a solution. 6 m = 24. 6 24 = 24. 30 not-equals 24. 19 is not a solution. 6 m = 24. 6 19 = 24. 25 = 24. 19 is a solution.