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VARVARA [1.3K]
3 years ago
11

I need help will mark brainliest if correct!

Mathematics
1 answer:
irina1246 [14]3 years ago
3 0

Answer:  -3x+3y = 9

This line passes through points A and C.

=============================================================

Explanation:

We can rule out choice A because this horizontal line does not pass through the center of the square. This line only passes through points B and C. There's no way it can be a reflection to have ABCD map onto itself.

Through trial and error, you should find that the answer is D.

Note that the line through points A and C passes through the center of the square located at (-2,1)

The equation of line AC is y = x+3 which rearranges to -x+y = 3. If we tripled both sides, then we end up with -3x+3y = 9. It's not clear why your teacher decided to triple both sides like this.

If we reflected the square over the line mentioned, then points B and D will swap places. Points A and C will stay where they are. Overall, square ABCD will map onto itself. This is another way of saying no change has occurred assuming we erase the point labels and just focus on the square itself.

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Quadrilateral WXYZ has vertices W(-4,-3), X(0,-1). Y(6,-2), Z(2,-4). Using properties of diagonals prove that WXYZ is a parallel
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Answer:

The diagonals are bisectors of each other and meet at  (1, -5/2) but are not congruent, so WXYZ is a parallelogram and not a rectangle

Step-by-step explanation:

for parallelograms.

the diagonals intersect at the midpoints

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Z                             Y

Diagonals are  WY  and  XZ

WY :   (-4, -3) to  (6, -2)

midpoint is   [(-4 + 6)/2  ,  (-3 - 2)/2 ] = ( 1, -5/2 )

XZ :   (0, -1)  to  (2, -4)

midpoint is  [ (0 + 2)/2 ,  (-1 + -4)/2 ]  = (1, -5/2)

The diagonals are bisectors of eachother.

Next show that these diagonals are not congruent.

length of  WY  =  root (  (-4 - 6)^2  +  (-3 - (-2))^2 )

WY = root ( 100  +  1)

WY = root(101)

length of XZ  =  root (  (0 - 2)^2  +  ( -1 - -4)^2 )

XZ =  root (4  +  9) = root (13)

we see that  WY  is not equal to XZ

...

so  ..  quadrilateral WXYZ is a parallelogram but not a rectangle.

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