In the coordinate plane, points (x, 8) and (20, y) are on line k. If line k passes through the origin and has slope 1/4, then x * y =
Answers:
A) 120
B) 100
C) 135
D) 140
E) 160
Line k passes through the origin and has slope 1/4 means that its equation is y=1/4*x.   Thus: (x, 8)=(32, 8) and (20, y) = (20,5) --&gt; x*y=32*5= 
<gadget id="calculator">32*5</gadget>
<output>160</output>
160.   Answer: 160
<result>E</result>
In the coordinate plane, points (x, 8) and (20, y) are on line k. If line k passes through the origin and has slope 1/4, then x * y =