曼哈顿国际英语

Mathematics

y=x+a
y=-x+a

In the system of equations above, a is a positive constant. If the system is graphed in the xy-plane, which of the following best describes the two lines?

A:Both equations represent the same line.
B:The lines are parallel.
C:The lines are perpendicular.
D:The lines intersect but are not perpendicular.

解析：

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