You have the following system of equations:
7x + 2y = 16
-21x - 6y = 24
In order to solve the previous system, you can multiply the first equation by 3, and then you can sum both equations, just as follow:
(7x + 2y = 16)(3)
21x + 6y = 48
21x + 6y = 48
-21x - 6y = 24
0 = 72
the previous result is wrong.
Hence, the given system of equation do not have solution
