False
Explanation:
The solution to the system of equations (-1,7) is FALSE because in the first equation, 5 multiplied by x which is -1 and y which is 7 doesn't give a result of -12. Instead, it gives a result of 2. This makes the solution a false one. In the second equation, 4 multiplied by x which is 7 subtracted from y which is 7 was supposed to be 3 but instead the result was 11 with this set of solutions.