Please Solve RD Sharma Class 12 Chapter Algebra of Matrices Exercise 4.2 Question 9 Maths Textbook Solution.
Answer: X = 3-21-21-1
and Y
= 02200-3
Hint: Try to take the one variable out by using Addition and Multiplication.
Given: 2X-Y = 6-60-421
and X+2Y
= 325-21-7
Here, we have to compute X and Y
.
Solution:
2X-Y =6-60-421
… (1)
X+2Y = 325-21-7
… (2)
Multiplying equation (1) with 2, we get:
2(2X-Y ) = 26-60-421
4X-2 Y = 12-120-842
… (3)
Adding equation (2) with equation (3), we get:
(4X-2 Y) + (X+2Y
) = 12-120-842
+ 325-21-7
4X-2 Y + X+2Y
= 12+3-12+20+5-8-24+12-7
5X = 15-105-105-5
X = 15
15-105-105-5
X = 3-21-21-1
Applying ‘X ’ value in equation (2), we get:
X+2Y = 325-21-7
3-21-21-1 + 2Y
= 325-21-7
2Y = 3-32+25-1-2+21-1- 7+1
Y = 12
04400-6
Y = 02200-3
Answer:
Hint: Try to take the one variable out by using Addition and Multiplication.
Given:
Here, we have to compute X and Y .
Solution:
… (1)
… (2)
Multiplying equation (1) with 2, we get:
… (3)
Adding equation (2) with equation (3), we get:
Applying ‘X ’ value in equation (2), we get: