A. | -76 |
B. | -28 |
C. | +28 |
D. | +72 |
Option: B Explanation : =5(20-30) - 3(10-18) + 2(5-6) = -50 + 24 - 2 = -28 Click on Discuss to view users comments. |
The solution(s) to the equations
2x + 3y = 1
x- y = 4
4x - y = a
will exist if a is equal to
A. | -33 |
B. | 0 |
C. | 9 |
D. | 12 |
Option: D Explanation : Equations are consistent when, 5a - 7 - 52 = 0 Click on Discuss to view users comments. |
The system of simultaneous equations
x + 2y + z = 6
2x + y + 2z = 6
x + y + z = 5
has
A. | unique solution |
B. | infinite number of solutions |
C. | no solution |
D. | exactly two solutions |
Option: C Explanation : Given equations are; x + 2y + z = 6; 2x + y + 2z = 6; x + y + z = 5 Given system can be written as Applying row operation Applying Since rank of co-efficient matrix is 2 and rank of argument matrix is 3, which is not equal. Hence system has no solution. Click on Discuss to view users comments. |