Need help! Not sure what exactly is going on here!

The sum of two numbers is 12 and their difference is 18 what are the two numbers

15 points what is the end behavior of this graph? & what is the asymptote of this graph?

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x