Write down the gradients of the straight lines in (i).
Based on your drawings in (i), identify the geometrical shape enclosed by the three graphs and \(x\)-axis.
Based on your answers in (ii) and (iii), write down ONE condition which guarantees that the two straight lines are parallel.
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Answer:(i) Graphs of \(y=-\dfrac12x+1\), \(y=-\dfrac12x-2\), and \(y=-1\) (ii) Gradients \(-\dfrac12\), \(-\dfrac12\), \(0\) (iii) Parallelogram (iv) Distinct straight lines with equal gradients are parallel