What is the answer? Please explain how to answer it too.

x=15

Step-by-step explanation:

8x=120

8x/8=120/8

x=15

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