Solving by Elimination with Subtraction

Solve by elimination:
4x + 4y = 4
3x + 4y = 10

• (7,-6)
• (-6,7)
• (6,7)
• (7,6)

What variable will be eliminated?
4x + 4y = 4
3x + 4y = 10

• The  x
• The  y
• neither
• both

Solve by elimination:
-x + 2y =  17
2x + 2y = -10

• (9,9)
• (-9,4)
• (-9,-4)
• (9,-4)

Solve by elimination:
7x - 9y = 29
7x + 2y = -15

• (-4,-1)
• (-1.-4)
• (-1,4)
• (-1,6)

Solve by elimination:
9x -  4y = 7
x -  4y  =  -17

• (-1,5)
• (-7,5)
• (7,5)
• (3,5)

3x  - 3y = 33
6x - 3y = 57

• (8,-3)
• (-3,8)
• (10,1)
• (10,-1)

Solve the system of Equation (x,y)
x +  4y =  –3
 x +  7y =  –12 

• (-3,9)
• (9,-3)
• (3,9)
• (9,3)

5x - 2y = 6
x -  2y  = -2

• (2,2)
• (2,1)
• (1,2)
• (-2,-2)

  7x + 2y = 24
   8x + 2 y = 30

• (6,-9)
• (-9,6)
• (-6, -9)
• (-6, 9)

  7x + 2y = 24
   8x + 2 y = 30
Should you add, subtract, or multiply the two equations?

• add
• subtract
• multiply
• unknown