Q.

Solving the equations x+y=5 and 2x-3y=4, the value of x is ________.

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a

10

b

9

c

12

d

11

answer is D.

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Detailed Solution

Given equations are, 

x+y=5……(i) 

2x-3y=4…….(ii) 

Multiplying (i) by 3 and (ii) by 1 we get, 

3x-3y=15 

2x-3y=4 

On subtracting these two equations we get, 

3x-3y-2x+3y=15-4 

Or, x=11. 

Hence, Solving the equations x+y=5 and 2x-3y=4, the value of x is 11. 

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