Chapter 15: Finding the Unknown

Answer Key (For Teachers)

1. Answer: $x=8$
   Working: Subtract 7.
2. Answer: $y=8$
   Working: Divide 4.
3. Answer: $x=7$
   Working: Add 3, divide 2.
4. Answer: $a=4$
   Working: $2a=8$.
5. Answer: $x=12$
   Working: Multiply 3.