Hi i need help with question 2,10,12 please

2. [0.5\" Points] DETAILS PREVIOUS ANSWERS WANEFMAC? 1.3.012.MI. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Decide which of the two given functions is linear, and nd its equation. HINT [See Example 1.] 10. [11 Points] DETAILS WANEFMAC? 1.3.066.M|. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find a linear equation whose graph Is the straight line with the given properties. HINT [See Example 2.] through (2.5, 18} and increasing at a rate of 1 unit ofy per 2 units ofx 1300 = ' Med Help? 11. [011 Points] DETAILS PREVIOUS ANSWERS WANEFMAC7 1.3.068. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Find a linear equation whose graph is the straight line with the given properties. through {1, 8) and (-1, 1) 12. [H Points] DETAILS WANEFMAC? 1.3.088. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER I The following table shows worldwide sales of a certain type of cell phone and their aveiage selling prices in 2013 and 2017. Year 2013 2017 Sales(millinns) 1,130 2,230 (a) Use the data to obtain a linear demand function for this type of cell phone. Use your demand equation to predict sales to the nearest million phones if the price is raised to $385. [j million phones (b) Fill in the blank. For every $1 increase in price, sales of this type of cell phone decrease by C] million units