What are the domain and range of the function?

Solve this system of equations. 12x − 18y = 27 4x − 6y = 10

Find the solution of this system of equation -7x+y=-20 9x-3y=36

The scatter plot shows the number of animal cells clara examined in a laboratory in different months: plot ordered pairs 1, 20 and 2, 60 and 3,100 and 4, 140 and 5, 180 what is the approximate predicted number of animal cells clara examined in the 9th month?