Solving Equations: Find the mistake!

Is the solution below correct?
5d = 2d - 18
-2d   -2d
3d = -18
d = 6

• Yes
• No

Tags

CCSS.HSA.REI.A.1

What is the error?

• Adding 2x to 3x

• Subtracting 5 from both sides

• Adding 2x to -2x

• Dividing by 5 on both sides

Tags

CCSS.HSA.REI.A.1

What is the error?

• Subtracting 1 from both sides

• Dividing by 6 on both sides

• 3(2x+1) equals 6x +1

• x equals 3/4

Tags

CCSS.HSA.REI.A.1

What is the error?

• Adding 1 to both sides

• Distributing the negative sign when multiplying –3(x + 2)

• Subtracting 6 from both sides

• x should equal 5/3

Tags

CCSS.HSA.REI.A.1

What is the error?

• Adding 5x to each side instead of 5

• Subtracting 7 from both sides

• Dividing -4 by 2 equals 2

• Dividing both sides by 2

Tags

CCSS.HSA.REI.A.1

6 - (2x - 4) = 8

6 - 2x - 4 = 8

2 - 2x = 8

-2x = 6

x = -3

Tags

CCSS.8.EE.C.7B