What is the slope of line k in the xy-plane above?

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问题

What is the slope of line k in the xy-plane above?

选项 A、-5
B、-1
C、0
D、1
E、5

答案D

解析 Recall that if a line passes through the points with coordinates(x¹,y¹)and(x²,y²), where x¹

x², then the slope of the line is

From the graph of line k in the xy-plane, you can conclude that the x-intercept of line k has coordinates(5,0)and the y-intercept of line k has coordinates(0, -5). Thus, the slope of line k is

The correct answer is Choice D.

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