**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. 5B. 1C. –5D. –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:**