Drag a statement or reason to each box to complete this proof.
If −3(x+8)=−21, then x=−1.

Answers:
1) -3(x + 8) = -21
2) Division Property of Equality
3) x + 8 = 7
4) Subtraction Property of Equality
Reasoning:
You are already given the equation, so that will be #1 in the Given.
#2 shows both sides being divided by -3, so you will put the Division Property of Equality.
#3 shows the Division Property after it is carried out, so you will put the equation after the division is done.
#4 shows you are subtracting 8 from both sides, so put the Subtraction Property of Equality.
Answer:
1. -3(x + 8) = -21
2. Division Property of Equality
3. x + 8 = 7
4. Subtraction Property of Equality