1. Choose the equation that is equivalent to 2.3 - w = 7.8
a. w - 2.3 = 7.8
b. w - 2.3 = -7.8
c. -w = -5.5
2. Write three equivalent equations.
3. Explain how you can prove that 4.5 is the solution of x - 1.2 = 3.3
4. Complete: If x - 6 = 21, then x + 7 = ??. Explain your reasoning.
Solve each equation.
5. m + 10 = 7
6. (1/6) - n = 2/3
7. d - (-27) = 13
8.5.7 + a = -14.2
Define a variable, write an equation, and solve each problem. Then check your solution.
9. Thirteen subtracted from a number is -5. Find the number.
10. A number increased by -56 is -82. Find the number.