Which step is not necessary when solving this system of equations by graphing? 3x-y=4 X+y=-4 O Identify the point of intersection. O Choose a method to graph the equations. O Determine the shaded area for each line. O Write the solution as an ordered pair. Unmark this question Save and Exit Next​

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.