(-3) x (-2z - 7) = 6z + 21 = 3 (2z + 7)
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The ordered triple is (x, y, z) = (1, -1, -2)
x+2y-6=z -z -z x+2y-z-6=0 +6 +6 ---------> x+2y-z=6 3y-2z=7 ---------> 0x+3y-2z=7 4+3x=2y-5z -3x -3x ---------> -3x+2y-5z=4 Put them into a matrix, for x,y,z and their answers. Solve for [A]-1[B], and the answer comes to: x= 1.75, y= 1.5, and z= -1.25
2.333333......... or, 2 and 1/3
3x+7=37 -7 -7 3x=30 /3 /3 x=10