I believe it is the linear pair theorem because the theorem is if two angles form a linear pair, then they are supplementary.
Note that perimeter of rectangle 
So we have to solve for width or w.



Width of a rectangle is 5 units.
Hope this helps.
r3t40
Hello!
The degree would be one because the x in this particular equation doesn’t have an exponent, so you assume that the exponent is one because 5x to the first power is equal to 5x.
I hope this helps!
When x is equal to -1:
f(-1)=6(-1)-3
=-7-3
=-10
y=-10
When x is equal to 0:
f(0)=6(0)-3
=0-3
=-3
y=-3
When x is equal to 1:
f(1)=6(1)-3
=6-3
=3
y=3
When x is equal to 2:
f(2)=6(2)-3
=12-3
=9
y=9