Use the vertical line test to determine whether the graph is the graph of a function

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.

You put the following items into your rucksack. ham 600 g cheese 380 g tomatoes 270 g how much do all the ingredients weigh in total?

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2