Question

hii! plz help me guys
what is wrong with my step

Answer 1

12+24=36 where as you write it 12

Answer 2

x - 3y = 12 ----------- [ 1 ]

x - 9y = -24 --------- [ 2 ]

*Here you need to decide if you want to "+" or "-" the 2 equations. In this case, since you are trying to eliminate "x", we will subtract:

[ 1 ] - [ 2 ] :

(x - 3y) - (x - 9y) = 12 - (-24)

x - 3y - x + 9y = 12 + 24

*You made a mistake here 12 - (-24) will give you 12 + 24 =  36

6y = 36

y = 6