# maths (matrix)

posted by
**shiha**
.

solve the equations by using

a) the adjoint matrix

b) elementary row operations

i) x+y+z=6

2x-y+z=3

x+4y-z=6

ii) 3p-3q+r=1

-3p+5q-2r=-1

p-2q+r=3

iii)-12a+b+17c=-14

2a-b+3c=5

8a+b-13c=-3

thanks sir/madam