Systems of Equations with Substitution I

Systems of Equations with Substitution I

Introduction

A system of equations is two or more equations that describe the same situation. Substitution helps us find the values that make both equations true. You might use this when comparing phone plans,...

Jack sits at his desk, studying a system of equations on the board: y = 2x - 4 and 7x - 2y = 5. He wonders how to find the values of x and y.

His teacher suggests using the substitution method, where a variable in one equation is replaced with an equivalent expression from the other equation.

Jack notices that the first ...