Elimination with Multiplication

Solve the system using Multiplication. 
2x + 3y = 12
5x - y  = 13

• x = -3, y = -2
• x = 1.5, y = 2
• x = 6, y = 0
• x = 3, y = 2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system by multiplication.
3x + 2y = 16
7x + y = 19

• (-2,5)
• (-2,-5)
• (2,-5)
• (2,5)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What number should we multiply by and on which equation?
3x + 2y = 16
7x + y = 19

• bottom, -2
• top, -2
• bottom, 3
• top, -3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve the system by multiplication.
2x + 10y = -20
-x + 4y = 28

• (-20,2)
• (1,4)
• (2,-20)
• (-2,2)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What number should we multiply by and on which equation?
2x + 10y = -20
-x + 4y = 28

• bottom, 2
• bottom, -2
• top, -1
• top, -2

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

Solve for x and y
3x + 2y = 16
7x + y = 19

• (-2,5)
• (-2,-5)
• (2,-5)
• (2,5)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

5x + 16y = -16
-9x - 8y = 8
Multiply bottom equation by 2

• (3, 1)
• (3, -1)
• (-3, -1)
• (0, -1)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

What number should we multiply by and on which equation?
14x - 9y = 1
-7x + 3y = 16

• bottom equation by 3
• bottom equation by -2
• top equation by -2
• top equation by 3

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

14x - 9y = 1
-7x + 3y = 16

• (10, -11)
• (-10, 11)
• (-11, 11)
• (-7, -11)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6

14x - 10y = -6
 7x - 2y = -18
Multiply bottom equation
by -5 or -2

• (-4, 5)
• (-4, -5)
• (4, 11)
• (-5, 4)

Tags

CCSS.8.EE.C.8B

CCSS.HSA.REI.C.6