A straight line passing through $R(1, -7)$, $S(5, k)$ and $T(9, 9)$ is obtained when $\lg y$

Question

A straight line passing through $R(1, -7)$, $S(5, k)$ and $T(9, 9)$ is obtained when $\lg y$ is plotted against $x$, where $x$ and $y$ are variables. Find $y$ in terms of $x$.[3] Show that $k = 1$.[2] Hence, find the value of $y$ at point $S$.[1]

Accepted Answer

(a) $y=10^{2x-9}$ (b) $k=1$ (c) $y=10$

2023 CSS AM S3 EOY Q2

2023 CSS AM S3 EOY Q2

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