Systems of linear equations: Two equations with two unknowns
              Solving systems of linear equations by substitution
  Solving systems of linear equations by substitution 
                    
    Solve the following system of equations. 
\[\lineqs{x-3\cdot y&=&5\cr
-8\cdot x-2\cdot y&=&-7\cr }\]
                        \[\lineqs{x-3\cdot y&=&5\cr
-8\cdot x-2\cdot y&=&-7\cr }\]
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