How do u solve x+2y=6 and 3x-2y=2 by substitution

Plot the points (0,6), (3,15.8), and (9.5,0) using the graphing tool, and find the function

What is the order of magnitude for the number of liters in a large bottle of soda served at a party

2people are trying different phones to see which one has the better talk time. chatlong has an average of 18 hours with a standard deviation of 2 hours and talk-a-lot has an average of 20 hours with a standard deviation of 3. the two people who tested their phones both got 20 hours of use on their phones. for the z-scores i got 1 for the chatlong company and 0 for talk-a-lot. what is the percentile for each z-score?