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16. Suppose the value of a piece of machinery decrease each year by $$10 \%$$ of its original value. If the original value RM8000, find an equation that expresses the value $$v$$ of the machinery $$t$$ years after purchase, $$0 \leq t \leq 10$$ . Sketch the equation. What is the slope resulting line?
y=8000$$\times$$0.9$$^{t}$$