Question

11. Ifm (-3 4]+n[4 -3] = [10 -11], then 2m + 5n =
a) 1
b) 5
c)3
d) 9​

Answer 1

Answer:

-3m+4n =10. ----------(I)

4m-3n =-11. ----------(II)

Now using elimination method

Multiplying (I) by 4 and (II) by 3

we get:-

-12m+16n=40

12m-9n=-33

On solving -12m and 12m gets canceled

we are left with:-

16n-9n=40-33

7n=7

n=1

Putting n= 1 in (I) we get m=-2

so 2m +5n= 2(-2)+5(1)= -4+5=1

ANS:- 1

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