# ALEX Classroom Resources

ALEX Classroom Resources
Subject: Mathematics (9 - 12), Mathematics (9 - 12)
Title: How Many Solutions?: Algebra 1, Episode 14: Unit 7, Lesson 5 | Illustrative Math
URL: https://aptv.pbslearningmedia.org/resource/im20-math-ep14-75/how-many-solutions/
Description:

This video lesson builds on the idea that both graphing and rewriting quadratic equations in the form of expression = 0 are useful strategies for solving equations. It also reinforces the ties between the zeros of a function and the horizontal intercepts of its graph, which students began exploring in an earlier unit.

Here, students learn that they can solve equations by rearranging them into the form expression = 0, graphing the equation y = expression, and finding the horizontal intercepts. They also notice that dividing each side of a quadratic equation by a variable is not reliable because it eliminates one of the solutions. As students explain why certain maneuvers for solving quadratic equations are acceptable and others are not, students practice constructing logical arguments (MP3).

Subject: Mathematics (9 - 12)
Title: Solutions to Systems of Linear Equations
URL: https://teacher.desmos.com/activitybuilder/custom/564a325345d9115d06270607
Description:

Students will use a Desmos activity to find solutions to systems of linear equations. This activity will help students understand what it means for a point to be a solution to a system of equations–both graphically and algebraically. This Desmo activity offers sample student responses and a teacher guide.

Subject: Mathematics (9 - 12)
Title: Systems of Two Linear Equations
URL: https://teacher.desmos.com/activitybuilder/custom/5807d7306ef115e7053a142a
Description:

Students will use a Desmos activity to solve systems of linear equations. In this activity, students write and solve a system of two linear equations to explore the numerical and graphical meaning of "solution." The activity closes by asking students to apply what they have learned to similar situations. This Desmos activity offers sample student responses and a teacher guide.

Subject: Mathematics (9 - 12)
Title: Card Sort: Linear Systems
URL: https://teacher.desmos.com/activitybuilder/custom/5798d64583de446662ea8ddd
Description:

In this Desmos activity, students practice what they have learned about solving systems of linear equations. The activity begins with a review of the graphical meaning of a solution to a system. Later, students consider which algebraic method is most efficient for solving a given system. Finally, students practice solving equations using substitution and elimination. Prior to beginning this activity, students should have experience solving systems of linear equations graphically and algebraically. This Desmos activity offers sample student responses and a teacher guide.

Subject: Mathematics (9 - 12)
Title: Line Zapper
URL: https://teacher.desmos.com/activitybuilder/custom/5df166d1fa83ee79c328d37d
Description:

In this Desmos activity, students "zap" lines by identifying their solutions to systems of equations. Students begin by zapping individual lines and then turn their attention to systems of linear equations where a single "zap" aimed at a point of intersection will capture multiple lines at once. Prior to beginning this activity, students should have experience solving systems of linear equations graphically and algebraically. This Desmos activity offers sample student responses and a teacher guide.

Subject: Mathematics (9 - 12)
Title: Playing Catch-Up
URL: https://teacher.desmos.com/activitybuilder/custom/5818fb314e762b653c3bf0f3
Description:

In this Desmos activity, students will develop their understanding of systems of equations, particularly as they're represented as tables, equations, and graphs. The students apply that understanding to the question, "Will one racer catch another?" This Desmos activity offers sample student responses and a teacher guide.

Subject: Mathematics (9 - 12)
Title: Solving Systems of Equations by Elimination
URL: https://www.youtube.com/watch?v=vA-55wZtLeE
Description:

In this video from Khan Academy, students learn about solving systems of equations by elimination. This video can be used during a lesson on solving systems of equations. The video is 12 minutes and 43 seconds in length and can be assigned through Google Classroom

Subject: Mathematics (9 - 12)
Title: Solving Linear Systems by Graphing
URL: https://www.youtube.com/watch?v=5a6zpfl50go
Description:

In this YouTube video from Khan Academy, students learn about solving linear systems by graphing. This video can be used during a lesson on solving systems of equations. The video is 8 minutes and 29 seconds in length and can be assigned through Google Classroom

Subject: Mathematics (9 - 12)
Title: Systems of Equations
URL: https://www.youtube.com/watch?v=nok99JOhcjo
Description:

In this video from Khan Academy, students learn about solving linear systems of equations. This video can be used during a lesson on solving systems of equations. The video is 9 minutes and 57 seconds in length and can be assigned through Google Classroom

ALEX Classroom Resources: 9