Recovering the equation from a straight line graph

Recovering the equation from a straight line graph

Secondary 3
TGM Original Questions

The diagram shows part of a straight line graph obtained by plotting \(xy\) against \(x\). The line passes through the points \((1,8)\) and \((5,0)\).

(i) Express \(y\) in terms of \(x\).

(ii) The line also passes through the point \((4,k)\). Find the value of \(k\).

Solution:

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Answer:\(y=\dfrac{10}{x}-2\); \(k=2\).

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