Which statement is true regarding the functions on the graph

Thelime contains the point(-3,0) and parallel x-3y=3( show all work)

He weights of 2-pound bags of best dog food are approximately normally distributed with a given mean  and standard deviation  according to the empirical rule, what percentage of the bags will have weights within 3 standard deviations of the mean? 47.5%68%95%99.7%

Which property was used to simplify the expression? 3c+9 +4c=3c+4c+9