# SL AI – Simultaneous Equations

##### Solving by Elimination

Try the question below but do all of these using Elimination. This method is explained on the videos.

##### Solving by Substitution

Try the question below but do all of these using Substitution. This method is explained on the video.

##### Solving by Using a Graph

Use the graph below to solve the equations, 2*y-*3*x=*4 and 3*y*+4*x*-23=0.

Answer: *x*=2 and *y*=5

##### Linear and Quadratic simultaneous equations

##### Using a Casio GDC to solve 2x2 simultaneous equations

##### Using a Casio GDC to solve 3x3 simultaneous equations

## Simultaneous Equations MIxed Up

## Desmos Wafers and Crème

Students predict which pack of cookies contains more calories. Students then learn the number of calories in each pack and use this new information to calculate the number of calories in a new pack of cookies.

## Desmos Gym Membership

In this activity, students analyze several gym membership plans in order to make a recommendation to a friend. The activity assumes some familiarity with linear equations, particularly how slope and intercept appear in equations and how they affect the graph. If your students need a quick refresher on these concepts, consider offering a brief review prior to starting this activity.