What are you required todo when you want to use a discount membership to save money

$5.41

step-by-step explanation:

$20 - $14.51 = $5.49.

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