You have provided two rational inequalities:

3.) $\dfrac{x + 2}{x - 4} \leq 0$

4.) $\dfrac{4x}{x - 6} \leq 1$

I'll go through each problem one by one.

3.) $\dfrac{x + 2}{x - 4} \leq 0$

1. Find the critical points by setting both the numerator and denominator equal to zero:

   • The numerator $x + 2 = 0 \Rightarrow x = -2$.
   • The denominator $x - 4 = 0 \Rightarrow x = 4$ (This is an excluded value because the denominator cannot be zero).

2. Test the sign of the expression in the intervals determined by the critical points:

   • $(-\infty, -2)$, $(-2, 4)$, and $(4, \infty)$.
   • Pick test points in each interval and evaluate the sign of $\dfrac{x + 2}{x - 4}$.

3. Determine where the expression is negative or zero (since we are solving for $\leq 0$):

   • The expression equals zero when $x = -2$.
   • Check where the fraction is negative to find the solution.

4.) $\dfrac{4x}{x - 6} \leq 1$

1. Rearrange the inequality to have zero on one side: $\dfrac{4x}{x - 6} - 1 \leq 0$ Combine the terms: $\dfrac{4x - (x - 6)}{x - 6} \leq 0 \quad \Rightarrow \quad \dfrac{3x + 6}{x - 6} \leq 0$

2. Find the critical points:

   • The numerator $3x + 6 = 0 \Rightarrow x = -2$.
   • The denominator $x - 6 = 0 \Rightarrow x = 6$ (This is an excluded value because the denominator cannot be zero).

3. Test the sign of the expression in the intervals determined by the critical points:

   • $(-\infty, -2)$, $(-2, 6)$, and $(6, \infty)$.
   • Pick test points in each interval and evaluate the sign of $\dfrac{3x + 6}{x - 6}$.

4. Determine where the expression is negative or zero (since we are solving for $\leq 0$):

   • The expression equals zero when $x = -2$.
   • Check where the fraction is negative to find the solution.

Would you like a more detailed breakdown of the steps, or do you want me to solve it fully and provide the solution?

Here are some follow-up questions:

1. How do you find critical points for rational inequalities?
2. Why is it important to exclude values where the denominator is zero?
3. How do test points help in solving inequalities?
4. What happens to the inequality when multiplying both sides by a negative value?
5. How do the signs of the numerator and denominator influence the inequality solution?

Tip: Always exclude values that make the denominator zero in rational inequalities.