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How do you find the value of this variable?
Given the points A(2,3) B(-4,3) C(5,-1) and D(1,x). If AB is parallel with CD, what is the value of x?
5 Answers
- Anonymous1 decade ago
This picture will help explain: http://pix.am/dBt0.png
In order for CD to be parallel to AB, D has to have the same Y coordinate as C so that they form a straight line, like A and B do, therefor, D has to be (1,-1).
- Google It!Lv 51 decade ago
if lines are parallel then they have the same slope
with two points, you can find slope by taking: y2 - y1 / x2 - x1
so AB = 3 - 3 / -4 - 2 = 0
if slope is zero, then the x coordinates have to be the same, so for CD to have a zero slope, "x" we are looking for must be -1
- Anonymous1 decade ago
I think it is - 1. The y value is 3 in both A and B
AB is y = 3
BD must be y = - 1 if it is parallel
- Anonymous1 decade ago
-1
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- Anonymous1 decade ago
The second number of A and B is the same. If the lines are Parallel, then same must be true of D and C.
Answer is -1
Hope this helps
