Question

1. Solve using Cramer's rule : 3x - y = 7 and x + 4y = 11
2. A die is rolled. Find the probability that number greater than 2 comes up.​

Answer 1

Q.1) Solution:- 3x - y = 7---------equation (I)

x + 4y =11---------equation (ii)

Now ,we have to multiply by 4 to equ.(I)

4(3x-y) = 7×4

12x -4y = 28

now,we have to add both the equations.

12x -4y = 28

x + 4y = 11

____________

13x = 39 , so, x= 3

now ,we put the value of x in equ. (I)

x + 4y = 11

3 + 4y = 11

so, 4y = 11- 3

so, 4y = 8

so, y = 2

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