John has 13 boxes of apples. each box holds 6 apples. if 7 of the boxes are full, and 6 of the boxes are half full, how many apples does john have?

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