waecmaths question:
Which of the following number lines illustrates the solution of the inequality $4\le \tfrac{1}{3}(2x-1)<5$?
Option A:
Option B:
Option C:
Option D:
waecmaths solution:
$\begin{align} & 4\le \tfrac{1}{3}(2x-1)<5 \\ & \text{Multiply both sides by}3 \\ & 12\le (2x-1)<15 \\ & \text{Add 1 to both sides} \\ & 13\le 2x<16 \\ & \text{Divide both sides by }2 \\ & 6.5\le x<8 \\\end{align}$Option D
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