Matthew Soon's answer to DumbFungus's Secondary 1 Maths Singapore question.
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This question tests your understanding of integers with positive and negative directions.
There is always a 'positive' direction. Let's take left and right as examples. If right is my positive direction, then left is my negative direction.
If I move +2 steps to the right, it is the same as taking -2 steps to the left. However, when calculating the distance I took, we will not say "minus 2 units" since distance has to be positive.
In your question, the avatar moved forward by h units (positive) and then moved backwards by -k units (positive). Total distance moved will simply then be (h-k) units.
There is always a 'positive' direction. Let's take left and right as examples. If right is my positive direction, then left is my negative direction.
If I move +2 steps to the right, it is the same as taking -2 steps to the left. However, when calculating the distance I took, we will not say "minus 2 units" since distance has to be positive.
In your question, the avatar moved forward by h units (positive) and then moved backwards by -k units (positive). Total distance moved will simply then be (h-k) units.
Date Posted:
3 years ago
@Dumbfungus : if the question were 'how far is the avatar from its original position?' it would be (h + k) units instead.
Thanks for the help, explanation was great too.
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