NEED WITHIN 10 MINUTES!!! What is the difference of the values of the two variables in this system of equations?

y= 2x + 1
x + 3y = 10

A. 0
B. 1
C. 2
D. 3

Asurvey of 45 teens found that they spent an average of 25.6 hours per week in front of a screen (television, computer, tablet, phone, based on the survey’s sample mean, which value could be the population mean? 2.3 hours 27.4 hours 75.3 hours 41.5 hours