Question

(7,1) perpendicular to y=-x+3

Answer 1

line perpendicular to y=-x+3
slope1=-1
for perpendicular line
slope1*slope2=-1
slope2=-1/slope1=-1/-1=-

Answer 2

line having slope 1
y=x+c and it pass through (7,1)
1=7+c
c=-6
y=x-6