The slope of XY is the same as the slope of AB because AB is parallel to XY and parallel lines have the same slope.
Answer:
Step-by-step explanation:
Note that in this diagram, point A represents point X, point B represents point Y, and point C represents point Z.
From the diagram, it appears as if
. To determine if this is the case, we can find the slopes of both segments.

Since these slopes are negative reciprocals, we know that they are perpendicular.
This means we can use the formula
, where b is the base (XY) and h is the height (XZ).
- Note these are interchangeable.
Using the distance formula,

This means the area is 
Answer:
<h2>y = 8</h2>
Step-by-step explanation:




Divide both sides of this eq'n by -9. You'll get y = -1.