There are 40 students in The class. Nine of those students are girls. What is the number of boys in the class ?

31 students

Step-by-step explanation:

31

Step-by-step explanation:

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