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

2x + y = -2

2y + x = -2

y.