How do you solve the system a + b + 2c = -11, a - 6b +3c = 22, 2a - 4b + c = 14?
Use Elimination Method, Matrices, Determinants, or Graphing to solve. I am going to use the Elimination Method.
Multiply Eq.1 by -1 and then add to Eq.2
Multiply Eq.2 by -2 and then add to Eq.3
Multiply R1 by 5 and add to R2
Put -5 in for b in R1
Put -5 for b and -2 for c into Equation 1 and solve for a.