Can somebody me? explain it (don't just answer it)

Ican figure out 20 shares multiply by $117.98 =2359.6920 shares multiply by $124.32=2486.40then take 40 shares multiply by $128.48=5139.20after that i'm lost any be greatly appreciated.

One line passes through (-7,-4) and (5,4) . another line passes through the point (-4,6) and (6,-9)

If a || b and b | y, then ? a) x || y. b) x | a. c) a | y. d) a || y.