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junior college 1 | H1 Maths
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why is this negative？
Date Posted: 3 years ago
Views: 335
Because, this is graph of y = f(x). y is plotted against x, not against t.
dy/dx → positive value (you can see that y is strictly increasing as x increases from a < x < b)
Given : dx/dt → negative
dy/dt = dy/dx × dx/dt
dy/dt = positive value × negative value
dy/dt = negative value.
dy/dx → positive value (you can see that y is strictly increasing as x increases from a < x < b)
Given : dx/dt → negative
dy/dt = dy/dx × dx/dt
dy/dt = positive value × negative value
dy/dt = negative value.
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