The solution of the system {2x-3y = 123x + ay = 5 is {x = C, y = - 2} to find the value of 4A + C

The solution of the system {2x-3y = 123x + ay = 5 is {x = C, y = - 2} to find the value of 4A + C

Substitute x = C, y = - 2 into the equation respectively
There is 2C + 6 = 12 and C = 3
3c-2a=5
We get 2A = 9-5
The solution is a = 2
Substituting a = 2, C = 3 into 4A + C
4 * 2 + 3 = 8 + 3 = 11