Systems of Equations using substitution

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

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

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve:

y = 7x + 9

2y + 2x = -14

• (5, 0)

• (9, 18)

• (-2, -5)

• (1, 16)

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

• (1, 9)
• (4, 14)
• (0, 1)
• (2, 4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What is the value of the y-coordinate of the solution to the system of equations 
x - 2y =1
x + 4y =7 

• 1
• -1
• 3
• 4

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

CHALLENGE: Three equations.
x + y + z = 4
x = -2y
z = -3y
Solve the system of equations using substitution.

• x = 2
  y = -1
  z = 3
• x= -5
  y = 3
  z = 1
• x = 10
  y = -2
  z = 0
• x= 4
  y = 1
  z = -1

Tags

CCSS.HSA.REI.C.6

Find the solution (b, w,y) to the following:

4b + 4w + 6y = 38

5b + 6w = 44

4b = 16

• (4, 4, 1)

• (4, 1, 4)

• (4, 8, 1)

• (1, 4, 4)

find the solution(x, y, b)

2b + x + 3y = 25

6b = 12

b + 2x = 14

• (6, 5, 2)

• (2, 6, 5)

• (2, 4, 2)

• (6, 1, 2)

What is the solution to this system?

y - 4x = 3

2x - 3y = 21

• (3,-9)

• (-3,-9)

• (-3,9)

• (0,1)

What is the solution to this system?

x + 6 = - 2y

2x + y = 6

• (-1,4)

• (4,-1)

• (6,-6)

• (3,1)

Which answer has a correct first step for this system:

3x + 3y = 3

y = 3x + 5

• The variable is already isolated, so we've already solved the system.

• The variable is already isolated for y, so we substitute it in the first equation and solve for x

  3x + 3(3x + 5) = 3

• Free sha vaca doo

• The variable is already isolated for y, so we substitute it in the second equation and solve for x

  y = 3(3x + 3y) = 3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6