Point b represents a positive number. which point represents the opposite of that number?

The opposite point is not labeled.

Step-by-step explanation:

The number line is marked at equal intervals, so the point B stands 5 units from zero; therefore, a point opposite of B must stand at the position 5 units left of zero. We see that the point 5 units left of zero is not marked—only point E is marked which is 4 units left of zero; therefore, the opposite point of B is not labeled.

for this case we have by definition, if two lines are perpendicular, then the product of their slopes is -1.

then, given the following line:

so,

we are looking for m_ {2}:

then, the line is given by:

we find "b" replacing the given point:

finally, the equation is:

option c