Verify that
(i) [adj A]–1 = adj (A–1)
(ii) (A–1)–1 = A
5 Evaluate 
x
y
x
y
y
x
y
x
x
y
x
y
+
+
+
6 Evaluate 
1
1
1
x
y
x
y
y
x
x+ y
+
Rationalised 2023-24
 100
MATHEMATICS
Using properties  of determinants in Exercises 11 to 15, prove that:
7 Solve the system of equations
2
3
10
4
+
+
=
x
y
z
4
6
5
1
+
=
x–
y
z
6
9
20
2
+
=
–
x
y
z
Choose the correct answer in Exercise 17 to 19