Elimination Method Practice

what would the top equation become when you multiply everything by -1?

• 2x - 6y = 20

• -2x - 6y = -20

• -2x + 6y = 20

• -2x + 6y = -20

4x +  8y = 20
-4x + 2y = -30
Which variable will be eliminated?

• The  x

• The  y

• The  z

• The unknown

2y-3x=-27

5y+3x=6

• (4,6)

• (8,2)

• (7,-3)

• (8,9)

After you right out the two equations what should you do?

• multiply one of the expressions so that you can eliminate.

• substitute

• simplify

• x

• y

• both

• neither

−4x − 4y = 0

4x + 4y = 0

• (−6, −4)

• Infinite number of solutions

• No Solution

• (6, 4)

• (0,0)

Solve using Elimination Method:

9x - 4y = 7

x - 4y = -17

• (-1,5)

• (-7,5)

• (7,5)

• (3,5)

Solve by elimination:

7x - 9y = 29

7x + 2y = - 15

• (-4,-1)

• (-1.-4)

• (-1,4)

• (-1,6)

Find x and y using the elimination method
2x+3y=7
2x+7y=11

• x=-2, y=-1

• x=2, y=-1

• x=2, y=1

• x=-2, y=1

Solve for x

Hint: Solve using Elimination Method:

• 1/2

• 1

• -1

• -1/2