Respuesta :

texaschic101
equation 1 : x + y + z = 3.25
equation 2 : 12x + 2y + z = 9.50
equation 3 : 2x + 4y + 5z = ??

u would multiply equation 1 by -12.....take that result and add it to equation 2....this eliminates x.

u would multiply equation 3 by -6...take that result and add it to equation 2....this eliminates x

Answer:

Multiply the first equation by -2 and the third equation by -6.

Step-by-step explanation:

Combine the first and second equations to eliminate x.

Multiply the first equation by -2:

-12x-12y-12z=-39

Add this to the second equation:

(-12x-12y-12z)+(12x+2y+z)=-39+9.5

                               -10y-11z= -29.5

                                  10y+11z=29.5

Combine the second and third equations to eliminate x:

Multiply the third equation by -6:

-12x-24y-30z=-84

(12x-24y-30z)+(12x+2y+z)= -84+9.5

                             -22y-29z=-74.5

                             22y+29z= 74.5

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