Q. 4 B

# Which of the following pair of linear equations has unique solution, no solution or infinitely many solutions. In case there is a unique solution, find it by using cross - multiplication method:2x + y = 53x + 2y = 8

Given pair of linear equations

2x + y = 5

3x + 2y = 8

As we can see that a1 = 2, b1 = 1 and c1 = – 5

and a2 = 3, b2 = 2 and c2 = – 8

Given pair of equations has unique solution

By cross - multiplication method, we have

On taking I and III ratio, we get

x = 2

On taking II and III ratio, we get

y = 1

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