  #### 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 ## Crack CUET with india's "Best Teachers"

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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: