4.3 Adding and Subtracting Equations

4.3 Adding and Subtracting Equations

The Main Goal:

Isolate the variable

Solve using Inverse operations.

• Operations that undo each other

• The inverse of addition is...

• Subtraction

• The inverse of subtraction is....

• Addition

Multiple Choice

24+m=49

• 25

• 73

Multiple Choice

12=y-11

• 1

• 23

Multiple Choice

22=13+a

• 9

• 35

Multiple Choice

t-40=3

• 37

• 43

Multiple Choice

What is the value of d?

• 9

• 93

Multiple Choice

The outside temperature dropped 20°F from the time Arianna ate breakfast until the time she ate dinner. When she ate dinner, the temperature was 35°F. Which of the following equations represents the situation?

• t-20=35

• t+20=35

• 20-t=35

• 20+t=35

Multiple Choice

What was the actual temperature outside at dinner time?

(Hint: solve t-20=35)

• 5°F

• 15°F

• 55°F

• 60°F