Systems of linear equations: Two equations with two unknowns
Solving systems of linear equations by substitution
Solve the following system of equations.
\[\lineqs{x+2\cdot y&=&7\cr
2\cdot x-6\cdot y&=&-9\cr }\]
\[\lineqs{x+2\cdot y&=&7\cr
2\cdot x-6\cdot y&=&-9\cr }\]
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