Exercise 6

Given that

$\begin{align*} L_{1} :& y = 2x + 3\\ L_{2} :& y + 2x = 4 \\ L_{3} :& 2y + x - 6 = 0 \\ L_{4} :& y - 1 = x + 2\\ \end{align*}$

Determine which of these lines are

a. parallel
b. perpendicular.

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