Hello everyone! Please help me with this! I don't undertsand how to solve it :(​

Solve x+3y=6 and 4x-6y=6 by elimination . show work !

Recall that the owner of a local health food store recently started a new ad campaign to attract more business and wants to know if average daily sales have increased. historically average daily sales were approximately $2,700. the upper bound of the 95% range of likely sample means for this one-sided test is approximately $2,843.44. if the owner took a random sample of forty-five days and found that daily average sales were now $2,984, what can she conclude at the 95% confidence level?

Which is the scale factor proportion for the enlargement shown?