8a Solve the following system of linear equations by variable substitution. -2x 34z y + 6x + y -15 38 3x + 102z 18 The result should end up as: x 17/3, y = 4, z = 1/102. 8b Find the reduced row echelon for of this matrix by Gaussian Elimination. 34| -15 | 38 102 | 18 -2 -1 1 3 You should get a familiar result for the rightmost column. The key here is not that the solution was faster, but instead that the method of solution is more organized.

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