Question

Which number line represents the solution set for the inequality 3x<-9

Answer 1

The answer would be the 3rd number line or "C"

Answer 2

Answer:

The graph in the attached figure

Step-by-step explanation:

we have

$3x < -9$

solve for x

Divide by $3$ both sides

$3x/3 < -9/3$

$x < -3$

The solution is the interval------>$(-infinite, -3)$ -

All real numbers less than $-3$

In a number line the solution is the shaded area to the left of the dashed line (open circle)

see the attached figure