Solve equations review

-3(4x - 10) = 42

• x = 0
• x = 1
• x = -1
• no solution

9 + 2a = -3 - 4a

• a = -2

• a = 2

• a = 5

• a = -1

Solve for d:
-7(6 + d) = 49

• 13
• 1
• -1
• -13

Find the error in the problem below
19 - 2k = 3k - 1
     +3k   +3k
19 + 1k = -1
-19           -19
k = -20

• They should have divided by 1 for the last step
• They should add 19 instead of subtracting 19
• I can not find an error
• Instead of adding 3k they should subtract 3k

Solve:
3(x - 2) = 18

• 6.7
• 4
• 8
• -4

What is the best first step to solve for n in the following equation?
3n - 7 = 30

• Divide 3n by 3
• Add 7 to both sides
• Subtract 30 from both sides
• Subtract 7 from both sides

2x - 3 + 4x = 27

• x= 12
• x = 4
• x = 5
• x = 15

85 = 5 (1 - 2x)

• x = -8

• x = 8

• x = 9

• x = -3

In the equation

x + 7 = 12

7 is being added to the variable, x.

How should you show your work to isolate the variable and solve the equation?

• Subtract 7 from both sides. The solution is x = 5.

• Add 7 to both sides.

  The solution is x = 19.

• Multiply both sides by 7 The solution is x = 84.

Jacob solved the following equation using the steps shown.

Step 1 5x + 9 = 2x - 3

Step 2 3x + 9 = -3

Step 3 3x = -12

Step 4 x = -4

What operation did he perform to get from Step 1 to Step 2?

• Subtracted 2x from both sides of the equation

• Subtracted 9 from both sides of the equation

• Multiplied both sides of the equation by 3

• Added -3 to both sides of the equation