The figure shows the graph of two perpendicular lines. Which of the following pairs of equations might have such a graph?
(a) y – 2x = 2
y + 2x = –1
(b) y – 2x = 0
2y + x = 0
(c) 2y – x = 2
2y + x = –2
(d) y – 2x = 2
x + 2y = –1
(e) 2x + y = –2
2y + x = –2
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