Elimination Algebra

Look on page 16 of your notes:
Ex 10:
8x - 4y = 12
-8x + 4y = 4
When solving using elimination, what variable cancels?

• x

• y

• Both variables

• Neither Variable

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Look on page 16 of your notes:
Ex 10:
8x - 4y = 12
-8x + 4y = 4
When solving using elimination, are you left with a true statement or a false statement?

• True Statement

• False statement

Tags

CCSS.8.EE.C.8B

Look on page 16 of your notes:
Example 6:
x + y = 5
x - y = -9
When solving using elimination, what variable cancels?

• x

• y

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Look on page 16 of your notes:
Example 6:x + y = 5
x - y = -9
Add these two equations.  What does it say after y cancels?

• 2x = -4

• 2x = 4

• 2x = -14

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Look on page 16 of your notes:
Example 6:
x + y = 5
x - y = -9
using the last step from the last question, solve for x.  Write the number.

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Look on page 16 of your notes:
Example 6:
x + y = 5
x - y = -9
You just found that x = -2.  
Find the value of y.  Just type in the value.

Tags

CCSS.HSA.REI.C.9

Solve the system:
x + 6y = 17
x - 3y = 8

• (5, 2)

• (11, 1)

• (1, 11)

• no solution

Tags

CCSS.8.EE.C.8B

• (5,-5)
• (-5,5)
• (5,5)
• (1,0)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system of equations
y=8x-5
y=2x+19

• (1,3)

• (2.4, 23.8)

• (2.5,15)

• (4,27)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve this system of equations
2x+y=9
y=5x+2

• (1,7)

• (2,5)

• (-1,-3)

• (5,-1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6