Question

Difficulty: MediumSolving One-Variable Linear Equations

Evaluate the given algebraic equation to solve for pp:

7−3(p+2)=p−77 - 3(p + 2) = p - 7

Which of the following represents the correct solution for pp?

  1. A
    5
  2. B
    -5
  3. C
    -4
  4. 2Answer

Answer

The correct value is 2.
The correct approach involves distributing the −3-3 into the parentheses to get 7−3p−67 - 3p - 6, combining like terms to get 1−3p1 - 3p, and then balancing the equation to solve for pp. Adding 3p3p to both sides yields 1=4p−71 = 4p - 7, and adding 77 gives 8=4p8 = 4p, which simplifies to p=2p = 2.

Step-by-Step Solution

1
Apply the distributive property to the left side of the equation.
7−3p−6=p−77 - 3p - 6 = p - 7
The -3 must be multiplied by both pp and 22 to eliminate the parentheses.
2
Combine the constant terms on the left side.
1−3p=p−71 - 3p = p - 7
Combining 77 and −6-6 simplifies the equation before moving terms across the equals sign.
3
Add 3p3p to both sides of the equation.
1=4p−71 = 4p - 7
This groups all terms containing the variable pp on the right side.
4
Add 77 to both sides and divide by 44.
8=4p⇒p=28 = 4p \Rightarrow p = 2
This isolates the variable pp to find the final numerical solution.

Key Concept

Solving Linear Equations with Distribution
Rate this question