I NEED HELP PLS SHOW THE NUMBER ON THE NUMBER LINE WHERE IT GOES

What is the value of  y  in the solution to the system of equations? x  +  y  =  12x  –  3y  =  –30a. –8b. –3c. 3d. 8

A. 127 cm^2 b. 144.5 cm^2 c. 172 cm^2 d. 50 cm^2

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?