The figure shows the graph of two parallel lines. Which of the following pairs of equations might have such a graph?
(a) x – 2y = 3 x + 2y = 7
(b) x + y = 2 x + y = –1
(c) x – y = –2 x – y = 1
(d) x – y = –2 2x – 2y = –4
(e) x + 2y = 2 x + 2y = –1
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