This simply means that one has to solve both simultaneous equations and find the value for x and y
x = 6y + 51-------- (1)
x =37 -4y -------(2)
since equation 1 and 2 are both x, we can equate both equations so that
6y + 51 = 37-4y
6y +4y =37 -51
10y = -14
We now substitute for y in say equation 1
x = 6(-1.4) +51
x = -8.4 + 51
x = 42.6
since x and y have values then the problem has a solution and also since x and y have just one solution the solution is finite ansd not infinite possibilities