Line L passes through the points (-2,0) and (0,a). Line LL passes through the points (4,0) and (6,2). What value of a makes the two lines parallel?
Choices.
A) 1  B) 2  C) 3  D) 4  E) 5
Find slopes first   Slope of L = (a - 0) / (0 - (-2)) = a / 2   Slope of LL = (2 - 0) / (6 - 4)= 
<gadget id="calculator">(2 - 0) / (6 - 4)</gadget>
<output>1</output>
1   For L and LL to be parallel, their slopes must be equal   a / 2= 1 , a = 2   correct answer 2
<result>B</result>
Line L passes through the points (-2,0) and (0,a). Line LL passes through the points (4,0) and (6,2). What value of a makes the two lines parallel?