In the coordinate plane, points (x, 2) and (4, y) are on line k. If line k passes through the origin and has slope 1/4, then x - y =  Choose the correct choice from the following answers.
A) 6
B) 7
C) 8
D) 9
E) 10
Line k passes through the origin and has slope 1/4 means that its equation is y=1/4*x.   Thus: (x, 2)=(8, 2) and (4, y) = (4,1) --&gt; x-y=8-1= 
<gadget id="calculator">8-1</gadget>
<output>7</output>
7.   Answer: 7
<result>B</result>
In the coordinate plane, points (x, 2) and (4, y) are on line k. If line k passes through the origin and has slope 1/4, then x - y =