Suppose a band at another school sells eraser for $2 per package. the band sells 220 package in all and earns a total of $695. write a system of equation to find the number of each type of package sold.

X= # of eraser packages = 135 
y= # of pencil packages = 85 

cost = 2x + 5y = 695
# of items = x+y= 220
                                                             2x+5y=695 
                                                            -2x -2y=-440
                                                              3y             255
                                                                  =            y=85             x+(85) / 220
                                                                3                3                                          
                                                                                                                            -85     -85
                                                                        
                                                                                                                               x=135 
2(135) + 5 (85) ?695
270+425?695
695+695

In all honesty, there really is no “work” per say to show. mainly it’s just using the process of elimination. the question is asking which domain(s) would be the most appropriate for the function c(n). n is the number of observed vehicles so right away, 1, 2, and 3 can be eliminated.why? 1, 2 start in the negatives and therefore it is impossible to observe negative cars. so, #4 would be the best answer to the given problem.