In the coordinate plane, points (x, 1) and (18, y) are on line k. If line k passes through the origin and has slope 1/2, then x + y = Answers:	A) 4.5	B) 7	C) 8	D) 11	E) 12
Line k passes through the origin and has slope 1/2 means that its equation is y=1/2*x.   Thus: (x, 1)=(2, 1) and (18, y) = (18,9) --&gt; x+y=2+9= 
<gadget id="calculator">2+9</gadget>
<output>11</output>
11.   Answer: 11.
<result>D</result>
In the coordinate plane, points (x, 1) and (18, y) are on line k. If line k passes through the origin and has slope 1/2, then x + y =