The math topic being practiced here involves solving systems of linear equations using simple variable substitution. Each problem presents a system with one equation straightforwardly expressing one variable in terms of another. The task is to substitute this expression into another equation to isolate and solve for the remaining variable. The solutions are provided as multiple-choice answers, testing the student's ability to apply substitution correctly and simplify the equations to find the correct value of the variable in question. This is a fundamental skill in algebra, particularly useful in contexts where systems of equations frequently occur.

Work on practice problems directly here, or download the printable pdf worksheet to practice offline.