Question 861536
7x + 5y - 2z = 57
-6x - 2y + 9z = -190
x + 4y + 2y = 11
7,5,-2,57
-6,-2,9,-190
1,4,2,11

determinant = -131
x = 1591/-131 = -12.1450382
y = -2404/-131 = 18.351145
z = 3292/-131 = -25.129771