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