SOLUTION: solve for z 3x + 4y + z = 11.5 2x - 2y - 3z = 1.5 4x + y - 2z = 12.5 (a) .5 (b) .2 (c) 5 (d) 1.5

Algebra ->  Algebra  -> College  -> Linear Algebra -> SOLUTION: solve for z 3x + 4y + z = 11.5 2x - 2y - 3z = 1.5 4x + y - 2z = 12.5 (a) .5 (b) .2 (c) 5 (d) 1.5      Log On

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 Question 118587: solve for z 3x + 4y + z = 11.5 2x - 2y - 3z = 1.5 4x + y - 2z = 12.5 (a) .5 (b) .2 (c) 5 (d) 1.5Answer by MathLover1(6801)   (Show Source): You can put this solution on YOUR website!..(1) (2) (3) Take (1) and (2), and eliminate ..(1) (2)->.multiply by +.add them -------------------------------- (a) Now take (2) and (3), and eliminate -> multiply by +.. add them ----------------------------- (b) Now take (a) and (b) and eliminate ->multiply by ->multiply by .. .. .. add them --------------------------- Now find (a) Now find (2). Check: Plug in values in original equations: ..(1)     (2)    (3) ) ) ) )