Answer:
x=-1.8, x=-8.2
Step-by-step explanation:
The equation with (x) in dogs and (y) in dollars is 
First, you must set up your equation.

Then, you must add like terms to simplify the equation

The value is 21 Because three represents those to variables which both equal to 21.
Answer:
(-6,-7)
Step-by-step explanation:
The diagonals are perpendicular is not true.