For two lines to be perpendicular, their slopes must be negative reciprocals of one another, mathematically:
m1*m2=-1, in this case our reference line has a slope of -3 so:
-3m=-1 divide both sides by -3
m=-1/-3
m=1/3
So the perpendicular line will have a slope of 1/3
The answer is definitely 31
You would just do 5.7-8.1, which is -3.6 degrees Celcius. Hope I helped!
im am pretty sure it is b.sometimes because an equation can have more then one answer
