Question 1123009
For the following system of linear equations, write the associated matrix equation (in the form Ax=b) and solve the matrix equation

2x1-3x2-7x3=-47
-4x1+6x2+8x3=64
add (2) times the first equation to the second equation: 
 4x1-6x2-14x3=-94
-4x1+6x2+ 8x3 =64 
-6x3 = -30
x3 = 5
2x1 - 3x2 = -47 + 35 = -12.