Question

the following determinants

Answer 1

Hey friend, Here is your answer-
Dx= |-1 a| = 3 - 12a............ (1)
|12 -3|
Dy = | 1 -1 | = 12 + b............ (2)
| b 12|
D = | 1 2| = -3 -4
|2 -3| = - 7
X = Dx/D = 3 -12a / -7
3 = 3- 12a / -7
-21 = 3- 12a
- 24 = - 12a
a = 2

Y = Dy/D = 12 + b / -7
-2 = 12 + b /-7
14 = 12 + b
b = 2

Hope it will help you.