The slope of the line, ax + by + c = 0, is:

1. $-\dfrac{a}{b}$

2. $-\dfrac{b}{a}$

3. $\dfrac{c}{b}$

4. $\dfrac{b}{a}$

If two lines are perpendicular to one another, then the relation between their slopes m₁ and m₂ is:

1. m₁ = m₂

2. $m$1 = \dfrac{1}{m2}

3. m₁ = –m₂

4. m₁ × m₂ = -1

Assertion (A): The angle of inclination of the line y = $\dfrac{x}{\sqrt{3}}$ – 5 is 60°.

Reason (R): The gradient m of a line is given by m = tan θ.

1. A is true, R is false

2. A is false, R is true

3. Both A and R are true

4. Both A and R are false

Assertion (A): The slope of the line perpendicular to the line passing through the points (2, 5) and (–3, 6) is given by 5.

Reason (R): The product of the slopes of two perpendicular lines is always –1.

1. A is true, R is false

2. A is false, R is true

3. Both A and R are true

4. Both A and R are false