a x + b y = c xy and p x + q y = r xy: divide by xy and solve

1. A.
   0
2. B.
   $\frac{1}{4}$
3. C.
   $\frac{1}{2}$
4. D.
   1

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1. A.
   $\left(-1,\ \frac{1}{6}\right)$
2. B.
   $\left(\frac{1}{6},\ -1\right)$
3. C.
   $\left(1,\ \frac{1}{6}\right)$
4. D.
   $\left(-\frac{1}{6},\ -1\right)$

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