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If s, t, u, and v are the coordinates of the indicated points on the number line above, which of the following is greatest?
- a)|s - v|
- b)|s - t|
- c)|s + v|
- d)|u + v|
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
If s, t, u, and v are the coordinates of the indicated points on the n...
First, we should notice that each choice can be interpreted as a distance between two points on the number line.
(A) |s - v| = t he distance bet ween s and v
(B) |s - t | = t he distance bet ween s and t
(C) |s + v| = |s - (-v)| = the distance between s and -v
(D) |u + v| = |u - (-v)| = the distance between u and -v
Thinking this way gives us a very straightforward way to solve the problem without doing any calculation. First we need to locate -v on the number line by just reflecting v over the origin at 0. (Recall that multiplication by -1 is equivalent to reflecting a point on the number line over the origin at 0.)
This makes it easy to see the distances the problem is asking us to compare:
Clearly, the greatest of these distances is (A).
(A) |s - v| = t he distance bet ween s and v
(B) |s - t | = t he distance bet ween s and t
(C) |s + v| = |s - (-v)| = the distance between s and -v
(D) |u + v| = |u - (-v)| = the distance between u and -v
Thinking this way gives us a very straightforward way to solve the problem without doing any calculation. First we need to locate -v on the number line by just reflecting v over the origin at 0. (Recall that multiplication by -1 is equivalent to reflecting a point on the number line over the origin at 0.)
This makes it easy to see the distances the problem is asking us to compare:
Clearly, the greatest of these distances is (A).
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