x = 2 and y = 7. This is 2 unknown and 2 equation...It's simply to combine. as below.
Step-by-step explanation:
-6x + 2y =2---> simplify like -3x + y = 1 then column add with -4x - y = -15---> so -7x = -14---->x = 2 and -4 (2) - y = -15 ---> -8 + 15 = y....so y = 7..
