Solve using the addition principle.
-x + 3 = 9
A)-12
B)6
C)-6
D)12

Question

Quizplus · Accepted Answer

To solve for x, we need to isolate it on one side of the equation. Using the addition principle, we can subtract 3 from both sides of the equation: 
x + 3 - 3 = 9 - 3 
x = 6 
Therefore, the solution is x = 6, which corresponds to choice B. To solve using the addition principle, we want to isolate the variable on one side of the equation. To do this, we will subtract 3 from both sides:

x + 3 - 3 = 9 - 3

Simplifying:

x = 6

Therefore, the answer is choice B, 6.

Solve Using the Addition Principle