Solving One-Step Equations

To identify which equation that doesn't belong, let's see if we can identify a pattern. Thus, solving each equation, using inverse operations, might help us.

Equation	Inverse operation	Solution
$n + 14 = 27$	$- 14$	$n = 13$
$12 + n = 25$	$- 12$	$n = 13$
$n - 16 = 29$	$+ 16$	$n = 45$
$n - 4 = 9$	$+ 4$	$n = 13$

Three equations have the solution $n = 13 .$ Thus, the equation that doesn't belong is $n - 16 = 29$ since it has a different solution.

Exercise 1.7 - Solution