Who ever answers the quickest and i get the right answer, they will get brainliest

Whats the name of the vertical axis

Solve the following pair of equations for x and y: ax/b_ by /a= a +b; ax - by = 2ab

Which of the following are arithmetic sequences? check all that apply. a. 0.3, 0.6, 0.9, 1.2, 1.5, b. 2, 3, 6, 11, 18, c. 150, 147, 144, 142, d. 2, 4, 9, 16, 25,