WILL GIVE BRAINIEST!!! IF UR ANSWER IS RIGHT

WILL GIVE BRAINIEST IF UR ANSWER IS RIGHT class=

Answer :

Answer:

-1

Step-by-step explanation:

the slope of this one is y=x-21

in order for it to be perpendicular the sign changes and the slope flips

but because the slope is 1 you just change the slope to -1