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\(q\) 3 The line \(L\) has equation \(2 x + 3 y = 7\)
Which one of the following is perpendicular to \(L\) ?
Tick one box. $$\begin{aligned} & 2 x - 3 y = 7
& 3 x + 2 y = - 7
& 2 x + 3 y = - \frac { 1 } { 7 }
& 3 x - 2 y = 7 \end{aligned}$$ □
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□ 4 Sketch the graph of \(y = | 2 x + a |\), where \(a\) is a positive constant. Show clearly where the graph intersects the axes.
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