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Big Ideas Math: Modeling Real Life, Grade 6
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Big Ideas Math: Modeling Real Life, Grade 6 View details
2. Solving Equations Using Addition or Subtraction
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Exercise 27 Page 256

Use the Subtraction Property of Equality to eliminate the addition.

k=12

Practice makes perfect
To solve the equation, we have to isolate k on one side. Using the Subtraction Property of Equality, we will subtract 6 from both sides of the equation. This will eliminate the addition and isolate k.
k+6=18
SubEqn

LHS-6=RHS-6

k+6-6=18-6
SubTerm

Subtract term

k=12
To check that this solution is correct, let's substitute k=12 into the original equation and simplify.
k+6=18
Substitute

k= 12

12 + 6 ? = 18
AddTerms

Add terms

18=18 âś“
Since the left-hand side and right-hand side are equal, k=12 is the correct solution.
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