Which of the following is the best example of a system of equations that should be solved by the elimination method? Question 2 options:

8x + 3y = 2

5x + 8y = -11

2x - 4y = -16

y = 5x + 13

-8x - 9y = -17

16x - 4y = 12

12x + 7y = -17

9x + 11y = -7

Ur environment is very sensitive to the amount of ozone in the upper atmosphere. the level of ozone normally found is 4.04.0 parts/million (ppm). a researcher believes that the current ozone level is not at a normal level. the mean of 2525 samples is 4.44.4 ppm with a standard deviation of 0.80.8. assume the population is normally distributed. a level of significance of 0.020.02 will be used. make the decision to reject or fail to reject the null hypothesis. answer tables