Express as linear combination

1. a) Express

4

5

9

         

as a linear combination of

1

1

2

         

,

1

2

3

         

and

2

2

4

         

b) Express

4

5

9

         

as a linear combination of

1

1

2

         

,

1

2

3

         

and

2

2

4

         

. Use a different answer than you did for a)