Name:Thursday section time:Student ID:Math 20F - Linear Algebra - Spring 2003Quiz #1 — April 10 — ANSWERS(Do not the discuss quiz with students who haven’t taken it yet – until 8:00pm.)You must show your work in order to get credit for a problem. Label your answers clearly.Consider the following system of linear equations:x1+2x2+3x3+4x4=32x1x2+8x3+6x4=8x3-x4=1a.Express this system of linear equations as an augmented matrix.b.Put it into reduced row echelon form (RREF).c.Which variables are free variables? Which variables are lead variables?
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