Verified answer

2..........1

|x....y....1|

|-3... 5...1| = 0

|2....7....1|

x......... 1

2y + 5x + (-21) -(-3y) -10 - 7x = 0

2y + 5x -21 + 3y -10 -7x = 0

-2x +5y - 31 = 0

| x y 1 |

| -3 5 1 |

| 2 7 1 |

| x y 1 |

| -3 5 1 |

det(M) = 5x - 21 + 2y - 10 - 7x + 3y = 0

5y - 2x - 31 = 0

pronto