Solve Systems of Equations Using Matrices · Example 4

Perform the needed row operation that will get the first entry in row 2 to be zero in the augmented matrix: $[\begin{array}{rlrlrl}1& & & -1& & \\ 4& & & -8& & \end{array}|\begin{array}{ccc}& & 2\\ & & 0\end{array}].$

Its source prints no answer for this problem, so there's nothing to check against.

OpenStax, Intermediate Algebra 2e · §4.5 Solve Systems of Equations Using Matrices · Example 4