If 
A
=
⎡
⎢
⎣
−
3
1
−
2
4
5
−
1
⎤
⎥
⎦
A
=
[
-
3
1
-
2
4
5
-
1

]
and 
B
=
⎡
⎢
⎣
4
−
3
0
−
2
−
2
4
⎤
⎥
⎦
B
=
[
4
-
3
0
-
2
-
2
4

]
then what is 
3
A
−
2
B
?
3
A
-
2
B
?

So the first thing we do is to multiply the top equation by 3. the reason i want to do this is i notice there will be a 6y on both equations and can possibly add/subtract them. so we get 6y = -3x + 27. adding that and the second equation we get 6x = 27-15 which is 12. divide by 6 and we get 2. ∴ x = 2. substituting 2 into the first equation we get 2y = -2 + 9 which is 7. divide by 2 and we get 7/2. ∴ y = 7/2, x = 2.

Yeah what she said right