Elimination and Substitution

Solve : 
3x-y=5
x+y=3

• X=2 , Y=1 
• X=1 , Y=2
• X= 1/2 , Y=4
• None of these are correct

3)  x-y=11
      2x+y=19

• (10,-1)
• (-1,10)
• (-1,-10)
• (-10,-1)

Solve by elimination 
-2x + 6y = 16
-4x  - 3y = 2

• (2,2)
• (-2, -2) 
• (-2,2)
• (2,1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve using elimination. 
 4x + 8y = 20
-4x + 2y = -30

• (-7,1)
• (2,-5)
• (-2,5)
• (7,-1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system by elimination.  

−8x − 10y = 20
−8x − 6y = −4 

• Infinite number of solutions  
• (6, 5) 
• (−6, −5) 
• (5, −6) 

Tags

CCSS.8.EE.C.8B

If x=5,find the value of 7x-1

• 34
• 36
• 35

If y=4,find the value of 3y+5

• 27
• 12
• 17

Solve:
y = -1x - 5
4x - 8y = 4

• (-3, -2)
• (5, -7)
• (3, 9)
• (-5, 4)

Solve:
y=8x+1
y=6x+3

• (1, 9)
• (4, 14)
• (0, 1)
• (2, 4)

Solve:
y = 2x - 2
-x + 8y = 14

• (2, 2)
• (6, 12)
• (1, 0)
• (1, -6)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6