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Match each system of linear equations with the graph that most closely matches it. Click on a graph to make it larger.

1. $\left\lbrace \begin{array}{rcl} z & = & 1 \\ x + z & = & 1 \\ z & = & -1 \end{array} \right.$

2. $\left\lbrace \begin{array}{rcl} z & = & 0 \\ x & = & 0 \\ y+z & = & 0 \end{array} \right.$

3. $\left\lbrace \begin{array}{rcl} -x + z & = & 1 \\ x + z & = & 1 \\ z & = & -1 \end{array} \right.$

4. $\left\lbrace \begin{array}{rcl} z & = & 1 \\ 3z & = & 3 \\ -1/z & = & -1 \end{array} \right.$

5. $\left\lbrace \begin{array}{rcl} x & = & 0 \\ x - z & = & 0 \\ z & = & 0 \end{array} \right.$

6. $\left\lbrace \begin{array}{rcl} x & = & 0 \\ z & = & 1 \\ z & = & -1 \end{array} \right.$

7. $\left\lbrace \begin{array}{rcl} x & = & 0 \\ y & = & 0 \\ z & = & 0 \end{array} \right.$

8. $\left\lbrace \begin{array}{rcl} x + z & = & 1 \\ z & = & 0 \\ 3x + 3z & = & 3 \end{array} \right.$

9. $\left\lbrace \begin{array}{rcl} z & = & 0 \\ 1/z & = & 1 \\ 3z - 3 & = & 0 \end{array} \right.$



A	B	C



D	E	F



G	H	I

You can earn 10% partial credit for 2 - 4 correct answers, 60% partial credit for 5 - 6 correct answers, and 80% partial credit for 8 correct answers.