Question

x+z=1,y+z=1,x+y=4 solve by using cramers rule

Answer 1

x=2, y=2 , z=-1

x+z=1--------1

y+z=1---------2

x+y=4--------3

then,

subtract the equation =3-2

(x+y)-(y+z)=4-1

x+y-y-z=3

x-z=3-----------4

now, by adding the equation 1+4

we get,

(x+z)+(x-z) =3+1

x+z+x-z =4

2x=4

x=4/2

x=2*****

by putting the value of x in equation 1, we get,

x+z=1

2+z=1

z=1-2

z=-1 *****

by putting the value of z in equation 2, we get,

y+z=1

y+(-1)=1

y-1=1

y=1+1

y=2 *******

hence, x=2

y=2

z=-1

Answer 2

Answer:

x=2

y=2

z=1

hope it is useful