Addition and Subtracting Equations

r + 20 = 27

• r = 7
• r = 47
• r = 13
• r = 20

s - 22 = 50

• s = 28
• s = 20
• s = 72
• s = 75

g - 15 = 30

• g = 35

• g = 45

• g = 15

• g = 12

S + 18 = 24

• S = 42
• S = 3²
• S = 18
• S = 4 + 2 

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.

y - 33 = 147

• y = 114
• y = 177
• y = 180
• Answer not Given

What equation matches this situation?

Jack had some markers and then bought 6 more. Now he has a total of 10 markers.

• m - 6 = 10

• m + 6 = 10

• 10 - 6 = m

• Answer not Given

17 = x + 3

• x = 20
• x = 14
• x = 13
• x = 19

x - 62 = 123
How should you show your work to isolate the variable and solve the equation?

• Add 62 to each side. 
• Subtract 62 from each side.
• Multiply each side by 62.
• Add 123 to each side.

What is the correct step to solve for the variable?
15 = m - 5

• add 15 to both sides
• add 5 to both sides
• subtract 15 from both sides
• subtract 5 from both sides