We are given a line segment $XY$ with coordinates $X(-8, -12)$ and $Y(p, q)$. The midpoint of $XY$ is $(-4, -2)$. We need to find the coordinates of $Y$, i.e., find the values of $p$ and $q$.

GeometryMidpoint FormulaCoordinate GeometryLine Segment
2025/4/11

1. Problem Description

We are given a line segment XYXY with coordinates X(8,12)X(-8, -12) and Y(p,q)Y(p, q). The midpoint of XYXY is (4,2)(-4, -2). We need to find the coordinates of YY, i.e., find the values of pp and qq.

2. Solution Steps

The midpoint formula states that the coordinates of the midpoint MM of a line segment with endpoints (x1,y1)(x_1, y_1) and (x2,y2)(x_2, y_2) are given by:
M=(x1+x22,y1+y22)M = (\frac{x_1 + x_2}{2}, \frac{y_1 + y_2}{2})
In our case, the coordinates of XX are (8,12)(-8, -12) and the coordinates of YY are (p,q)(p, q). The midpoint is (4,2)(-4, -2). Applying the midpoint formula, we have:
(4,2)=(8+p2,12+q2)(-4, -2) = (\frac{-8 + p}{2}, \frac{-12 + q}{2})
This gives us two equations:
8+p2=4\frac{-8 + p}{2} = -4
12+q2=2\frac{-12 + q}{2} = -2
Now, we can solve for pp and qq:
8+p=2(4)-8 + p = 2(-4)
8+p=8-8 + p = -8
p=8+8p = -8 + 8
p=0p = 0
And:
12+q=2(2)-12 + q = 2(-2)
12+q=4-12 + q = -4
q=4+12q = -4 + 12
q=8q = 8
Therefore, the coordinates of YY are (0,8)(0, 8).

3. Final Answer

(0, 8)
So, the answer is B.

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