Answer:
5x+4
Step-by-step explanation:
well the perimeter is the sum of all sides
so we have
90 degree clockwise rotation is described by the matrix,
If you apply the matrix to the vector 
you get,
So false.
Hope this helps.
Answer:
inverse variation
Step-by-step explanation:
the numbers equal but then have to be devided
You need to add one equation to the other. To do this, multiply the divide the entire equation by 2. The resulting equation gives: -6x + 3y = 9
Now, add this to the second. Doing this will cancel out the 6xs because they are opposite signs.
-4y = 4 is your simplified equation.
Solve for y: y = -1
Plug this into an original equation.
-12x + 6(-1) = 18
-12x -6 = 18
-12x = 24
x = -2
