x1+3x=5 and 3x1-x2= -5 solve by Matrix

Question

Algebra equation solving by Matrix

Answer 1

Probably your first equation's second term should be 3x₂.

 

Write the augmented matrix 

1  3  5

3 -1 -5

and do row-operations, either by hand or by calculator.  

 

Hint: x = 2.