Triangle $$\(A B C\)$$ is similar to triangle $$\(P Q R\)$$ $$\(A B=4 \mathrm{~cm} \quad P Q=12 \mathrm{~cm} \quad R Q=16.5 \mathrm{~cm} \quad A C=x \mathrm{~cm} \quad P R=y \mathrm{~cm}\)$$ (a) Calculate the length of $$\(B C\)$$ $$\(\mathrm{cm}\)$$ (2) (b) Write down an expression for $$\(y\)$$ in terms of $$\(x\)$$ $$\(y=\)$$ (1)

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