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A resource planner at a manufacturing plant uses a system of linear equations to model the usage of three different materials (xx, yy, and zz):

{x+2y−3z=−1x−3y+z=12x−y−2z=2\left\{\begin{array}{l} x + 2y - 3z = -1 x - 3y + z = 1 2x - y - 2z = 2 \end{array}\right.

During the elimination process, the planner reduces the system to the following two-variable sub-system:

{4x−7y=24x−7y=4\left\{\begin{array}{l} 4x - 7y = 2 4x - 7y = 4 \end{array}\right.

By subtracting the second equation from the first to eliminate the remain

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Updated 2026-09-19

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