a and b for which two linear equations have infinitely many solutions

1. A.
   $a = 1, b = -1$
2. B.
   $a = -1, b = -1$
3. C.
   $a = -1, b = 1$
4. D.
   $a = 1, b = 1$

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1. A.
   $a = -\frac{3}{2}, b = 2$
2. B.
   $a = 2, b = -\frac{3}{2}$
3. C.
   $a = 3, b = -\frac{2}{3}$
4. D.
   $a = 3, b = -\frac{3}{2}$

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