Vineet solved a system of equations by substitution. In his work, he substituted an expression for one of the variables and solved for the value of the other. This resulted in the equation 7 = 9. What can Vineet conclude? The solution to the system is (7, 9). The system of equations does not have a solution. The work must be incorrect because it is not possible to get this equation. The system of equations has infinitely many solutions.