Solve The Following System Of Linear Equations Using The Substitution Method. a. $\left\{\begin{array}{l}4 X+y=23 \\ Y=6 X+3\end{array}\right.$ b. $\left\{\begin{array}{l}x=y-6 \\ 5 X+2 Y=-2\end{array}\right.$ c. $\left\{\begin{array}{l}x+5 Y=72 \\ X=7

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