Choose correct alternative for each of the following question

Solution:
B. 3
Explanation:

2. For simultaneous equations in variables x and y, D_X = 49, D_Y = –63, D = 7, then what is x?
A. 7
B. –7
C. 1/7
D. -1/7

Solution:
A. 7
Explanation:

Solution:
D. 1
Explanation:

4. To solve x + y = 3; 3x–2y – 4 = 0 by determinant method find D.
A. 5
B. 1
C. –5
D. –1

Solution:
C. -5
Explanation:

5. ax + by = c and mx + ny = d and an ≠ bm then these simultaneous equations have –
A. Only one common solution.
B. No solution.
C. Infinite number of solutions.
D. Only two solutions.

Solution:
A. Only one common solution.
Explanation: