Systems of Equations: Introduction

50 Minute Class, Algebra 1, Curriculum

Learning Goal: Understand the purpose and meaning of the point of intersection and make connections between representations.

3 Act Math:



  • Common Core
    • HSA.REI.C.6 – Solve systems of linear equations exactly and approximately (e.g., with graphs), focusing on pairs of linear equations in two variables.
  • TEKS (2015-16)
    • A.5(C) – solve systems of two linear equations with two variables for mathematical and real-world problems

2 thoughts on “Systems of Equations: Introduction

  1. I used this as a introduction to systems and really liked it. I especially loved that students noticed the “equal” stacks weren’t exactly equal. How did you explain the y-intercept for zero cups wasn’t zero centimeters in a way that made sense to students?

    1. Thank you for the comment and feedback! Andrew Stadel did a great job designing that lesson.

      For the y-intercept, I told them that it would make more sense to label our table as the number of cup rims for the x values and the total height for the y values. That way, if you take away all the rims, theoretically there would still be the base of the cup left over. Also, I really tried to emphasize how the height was changing. It was growing by an additional cup rim each time. Then, I asked what stayed the same the whole time which was the base of the cup.

      Let me know if that helps!

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