40 people are in a classroom. Everyone is sitting in either pairs of desks (2 desks together) or in a group of 4 (4 desks together). All 40 people are sitting in their own desk. There are 2 more pairs of desks than groups of desks. How many of each seating arrangement is there?

i would need to see the dot plot : )

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