Solve this system:
-6r+5s+2t=-11
-2r+s+4t=-9
4r-5s+5t=-4

Step-by-step explanation:

Given the system of three linear equations:

Cheange the positions of the first and the second equations:

Multiply the first equation by -3 and add it to the second equation and then multiply the first equation by 2 and add it to the third equation:

Multiply the second equation by 3, the third equation by 2 and add them:

From the third equation,

Substitute it into the second equation:

Substitute and into the first equation:

Hence,

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