Question

solve with the help of matrices x-2y=3 , 3x+y=16​

Answer 1

Answer:

x-2y=3

3x+y=16

AX=B

So find rank of matrices

1 -2 x=3

3 1 y=16

C= A:B

1 -2:3

3 1:16

R2=R2-3*R1

1 -2:3

0 7:7

Rank of c=2=number of unknown 2

so it has unique solution

y=7

x-2y=3

put the value of y in equation 1

x-14=3

x=-11

Answer 2

Answer:

Hence, x=5 and y=6.