## Elementary and Intermediate Algebra: Concepts & Applications (6th Edition)

Substituting the ordered coordinates of $( 1,2 )$ in the given equation, $c=d+1 ,$ results to \begin{array}{l}\require{cancel} c=d+1 \\\\ 1=2+1 \\\\ 1=3 \text{ (FALSE)} .\end{array} Since the substitution above resulted in a FALSE statement, then the given point is $\text{ NOT a solution }$ to the given equation.