Write down the system of equations of when and a_{ij}= i + j for , , , , while b_{j}= j = 1, ,

Answer is:

2x_{1}+ 3x_{2}+ 4x_{3}= 1

3x1 + 4x_{2}+ 5x_{3}= 2

4x_{1}+ 5x_{2}+ 6x_{3}= 3

Seems like an easy question but not really sure on what they're asking so any clarification will greatly help. Thanks!