I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist I’ll mark you brainlist

-1

Step-by-step explanation:

When a line is perpendicular to another line, it means that the line is going through the other line. So that means they have the opposite slope or the reciprocal of the first line and you change the sign to become opposite.

y=x-4 ---> find reciprocal of x

y=-1x-4

slope= -1