Answer:
your answer should be (-3,-7)
The answer is 6-------------------------
Yes it does have to be parallel or else it would not be a rectangle.So it is true.
Hope this helped! :)
Step-by-step explanation:
Assume that

hence,

now,

attached below is the complete solution
21 cars, 32 motorcycles.create a system of equations using x for cars and y for motorcycles.

multiply the top equation by 2 to prepare for elimination method

subtract terms

divide both sides by negative 2 to solve for x
x =21
plug in x into original equation to solve for y.
21 + y = 53
subtract both sides by 21
y=32