In the xy-coordinate system, if (m, n) and (m + 2, n + k) are two points on the line with the equation x = 2y + 5, then k =	Pick one:
A) 1/2  B) 1  C) 2  D) 5/2  E) 4
The equation of the line can be re written as y = (1/2)x - 5/2.   Slope = 1/2, which means for every 1 unit increase in the y co-ordinate, x will increase by 2 units.   Hence k = 1.   ANSWER:1
<result>B</result>
In the xy-coordinate system, if (m, n) and (m + 2, n + k) are two points on the line with the equation x = 2y + 5, then k =