Find the Error - Solving Equations

What is the first step in solving this equation:
5x + 7 = 12

• Divide by 5
• Subtract 5
• Multiply by 7
• Subtract 7

Tags

CCSS.7.EE.B.4A

Find the Error
What error did the student make when solving the equation:
5x + 6 =  66
5x - 6 = 66 -6
5x = 60
5*5x= 60*5
x = 300

• The student subtracted 6 from both sides instead of adding
• Student multiplied by 5 instead of dividing by 5
• Student got the wrong answer when subtracting 66-6
• The student did not correctly eliminate the variable from one side of the equation

Tags

CCSS.HSA.REI.A.1

The steps in solving 5b - 6 = 24 are: 

• Add 6 to both sides and divide both sides by 5
• Add 6 to both sides and multiply both sides by 5
• Subtract 6 from both sides then multiply both sides by 5
• Subtract 6 from both sides then divide both sides by 5

Tags

CCSS.7.EE.B.4A

The steps in solving
4b + 4 = 24 are: 

• Add 4 to both sides then divide both sides by 4
• Add 4 to both sides then multiply both sides by 4
• Subtract 4 from both sides then multiply both sides by 4
• Subtract 4 from both sides then divide both sides by 4

Tags

CCSS.HSA.REI.A.1

Solve for the variable. 3x=-27

• x=9
• x=-30
• x=-9
• x=-24

Tags

CCSS.6.EE.B.7