11.30.22 Elimination method

Do Now

Classify each solution as One solution, No solution, or
infinitely many solutions. Explain your reasoning.

a.

b.

*First complete exit ticket 11.29. Then, do the do now

on your tracker.*

Open Ended

Classify each solution as One solution, No solution, or infinitely many solutions. Explain your reasoning.

Announcements

1. Coach class is today, not tomorrow.
2. Today is the last day to complete OLD Q2

assignments from before this week.

3. Homework is due on SUNDAY.

Today’s Goal

I can use the elimination method to solve a
system of equations.

Today’s Agenda

Intro to Elimination Method
Practice
Exit Ticket

Unit 2!!

Quick Practice:

Which of the following are additive inverses?

1. -5 + 5 =

2. 3 + -6 =

3. 7 + -7 =

0

-3

0

System of Equations Review

1. The solution to a system of equations is

_____________________________________________an ordered pair (x, y) that makes BOTH
equations true.

Exploration - Part 1

What

happened?

Added the equations
vertically. The y-
variables cancelled.

Divided by 5 on both
sides

Exploration- Part 2

What

happened?

Plugged in 3 for x
into one for the
original equations

Multiplied 3 times 3

Subtracted 9 on
both sides.

Divided by 5 on both
sides

Exploration

What is the solution to our

system of equations?

(3, -5)

Example #1

Solution: ( , )

Example #2
Solution: ( , )

Guided Practice #1
Solution: ( , )

Guided Practice #2
Solution: ( , )

Elimination Practice

1. Work independently or in your groups to

complete 11.30 Elimination practice
handout.
a. After completing each question in Part

1, make sure to check your answers with
your teacher.

Today’s Goal

I can use the elimination method to solve
a system of equations.

Reflect

Did we accomplish our goal?
What mathematical processes do we use inside of
the elimination method?

Exit Ticket