Linear Equation Systems - Simple Number Substitution

This math topic focuses on solving linear equation systems through simple number substitution. Specifically, it addresses substituting a given variable's value from one equation into another to isolate and solve for a different variable. Practice is structured around multiple problems where a system of equations is presented, and learners must substitute the known value to find the unknown variable. Each problem provides several choices for the answer, enhancing understanding and mastery of algebraic concepts within the broad unit on introductory algebra systems of equations.