The kinetic energy transfers from the moving ball to the non-moving ball.
Yes because you use the distributive property
Answer:
a=7
Step-by-step explanation:
The image is rendered and attached below.
Triangle WXY is an Isosceles right triangle, since WX=XY.
First, we determine the length of WY using Pythagoras Theorem.

Since triangle WXY is Isosceles, 

Therefore:
Triangle WYZ is a right triangle with WZ as the hypothenuse.
Applying Pythagoras Theorem

-x - y = 1 . . . . . (1)
y = x + 3 . . . . . (2)
Putting (2) into (1), gives:
-x - x - 3 = 1
-2x = 1 + 3 = 4
x = 4/-2 = -2
From (2), y = -2 + 3 = 1
Therefore the two line will intersect at the point (-2, 1)
The answer is definitely A. Hope this helps!