Exercise 18 Page 443

k=-12

Practice makes perfect

To solve the equation, we have to isolate k on one side. Using the Subtraction Property of Equality, we can subtract 3 from both sides of the equation. This will eliminate addition on the left-hand side and isolate k.

k+3=-9

LHS- 3=RHS- 3

k+3- 3=-9- 3

Subtract terms

k=-12

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

k+3=-9

k= -12

-12+3? =-9

Add terms

-9=-9 ✓

Because the left-hand side and right-hand side are equal, k=-12 is the correct solution.

Guided Practice p.440

Independent Practice p.441-442

H.O.T. Problems p.442

Standardized Test Practice p.442-444

Extra Practice p.443

Common Core Review p.444

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