¡¡geometry. cosines/sines. include explanation and clear answer.

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.

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

Type the correct answer in the box. use numerals instead of words. if necessary, use / for the fraction bar.