Hi,

x+y+3z=-1

x+2y-2z=-2

4x+12y+kz=-11

D=

D= 

D = a1(b2c3-c2b3) - b1(a2c3-c2a3) + c1(a2b3-b2a3) 

 0 = (2k+24)-(k+8) + 3(4)

-28 = k 

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