Eric Nicholas K's answer to Georgia Jansen's Secondary 4 A Maths Singapore question.
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Let me know if my workings are not clear.
Date Posted:
5 years ago
Decreasing function means the graph goes down as x increases (as the graph goes to the right). When a graph appears to be down-sloping, its gradient is negative. Hence, dy/dx is always negative in that region, or dy/dx < 0.
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