Elimination Add or Subtract

3x + y = 13

x + y = 3

Solve. Put your answer in as a coordinate point (x,y)

6x - 2y = 10

x -2y = -5

Solve. Put your answer in as a coordinate point (x,y)

-5x - y = -2

5x -3y = 14

Solve. Put your answer in as a coordinate point (x,y)

7x - 4y = -10

-x + 4y = -2

Solve. Put your answer in as a coordinate point (x,y)

x + 2y = -2

4x + 2y = -20

Solve. Put your answer in as a coordinate point (x,y)

-6x - 5y = 20

-6x - y = 4

Solve. Put your answer in as a coordinate point (x,y)

-3x + y = -2

-7x + y = 2

Solve. Put your answer in as a coordinate point (x,y)

Consider the system of equations: 2x+4y=10 12x-4y=20 Should we add or subtract to eliminate a variable?

• 
  ADD, because the 4s have the same sign

• ADD, because the 4s have different signs

• SUBTRACT, because the 4s have different signs

• SUBTRACT, because 2 and 12 have the same sign

Consider the system of equations: 10x + 6y = -54 12x - 6y = 18 Should we add or subtract to eliminate a variable?

• 
  ADD, because the 6s have the same sign

• ADD, because the 6s have different signs

• SUBTRACT, because the 6s have different signs

• SUBTRACT, because the 6's have the same sign

Consider the system of equations: 4x + 6y = 14 4x - 2y = 10 Should we add or subtract to eliminate a variable?

• 
  ADD, because the 4s have the same sign

• ADD, because the 4s have different signs

• SUBTRACT, because the 4s have different signs

• SUBTRACT, because the 4s have the same sign