 Solution

ID: past-exam-of-the-mathematics-course-of-the-year-1-of-the-natural-sciences-course-of-the-university-of-cambridge/2013/paper-1/11/a/solution

Collect the coefficients of the three unknowns in rows. The linear system has matrix form

A x = b, A = 112 2 - 2 1 31 - 1, x = x y z, b = 1401 .

The next two parts solve this same system by the two requested methods.

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