5.3 - Solve Systems of Equations by Elimination

Find the X-value

100

Find X: 

-2y + 15x= -24 

2y + 9x= -24 

What is -2 

200

Find X:

-7y -4x= 1 

7y + 9x= -24 

What is -9 

300

Find X: 

-9y + 4x= 6 

9y + 5x= -33 

What is -2 

400

DAILY DOUBLE!!

Find X:

-4x + 4y =8 

9x - 8y= -13 

What is 3 

500

Find X: 

7x + y= 13

20x + 4y= 36

What is 2

Find the Y-value

100

Find Y: 

-7y -4x= 1

7y -2x= 53

What is -5

200

Find Y: 

-2y + 15x= -24 

2y + 9x= -24

What is -3

300

Find Y: 

-6y + 11x= -36

-4y + 7x= -12 

What is -60 

400

Find Y: 

-6x -2y= -4

-12x -5y= -1

What is 5

500

Find Y: 

-6x + 8y= 2 

6x -5y= -8 

What is -2

Vocabulary

100

A set of two or more equations 

What is system of equations?

200

A symbol you use if you want to shade above a dashed line

> "Greater than"

300

A symbol you use to indicate shading below a solid line

< "Less than or equal to"

400

A symbol or number that we do not know yet. 

What is a Variable 

500

What is a linear equation?

A linear equation is an algebraic equation that has a constant rate of change or slope (y=mx+b)

OR

A graphed straight line

Step by Step

100

What is the 1st step in solving a system of equations using elimination?

Cross multiply the coefficients of x (the numbers in front of x)

200

What is the 2nd step in solving a system of equations using elimination?

Subtract each equation from each other

300

What is the 3rd step in solving a system of equations using elimination?

Solve for the y value

400

What is the 4th step in solving a system of equations using elimination?

Substitute the y value into either one of the equations

500

What is the 5th and 6th step in solving a system of equations using elimination?

Solve for the value of x and write as coordinate points