If x = 2, y = - 1 is a solution of binary linear equation AX-2 = - by, then the value of 4a-2b-60 is equal to?

If x = 2, y = - 1 is a solution of binary linear equation AX-2 = - by, then the value of 4a-2b-60 is equal to?

Take x = 2, y = - 1 into the equation, which is 2a-2 = B, and take it into 4a-2b-60, which is 4a-2 (2a-2) - 60 = - 56