(a) (i) Using a scale of 2 cm to 1 unit on both axes, on the same graph sheet, draw the graphs of $y-\frac{3x}{4}=3$ and $y+2x=6$.
(ii) From your graph, find the coordinates of the point of intersection of the two graphs.
(iii) Show, on the graph sheet, the region satisfied by the inequality $y-\frac{3}{4}x\ge 3$.
(b) Given that $x^2+bx+18$ is factorized as $(x+2)(x+c)$. Find the values of c and b.


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