Tangent or normal at the point where a curve crosses an axis

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

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1. A.
   $x-3y=0$
2. B.
   $x+3y=0$
3. C.
   $x+2y=0$
4. D.
   $3x+y=0$

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1. A.
   $\ x + 5y = 2$
2. B.
   $\ x - 5y = 2$
3. C.
   $\ 5x - y = 10$
4. D.
   $5x + y - 10 = 0$

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1. A.
   $x + y = ab$
2. B.
   $\frac{x}{a} + \frac{y}{b} = 1$
3. C.
   $ax + by = 1$
4. D.
   $x + y = a + b$

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