Introductory Algebra for College Students (7th Edition)

The given number is a solution if it satisfies the given equation. Substitute $3$ to $x$ to obtain: $4x+5=13 \\4(3) + 5=13 \\12+5 = 13 \\17 = 13$ The result is a false statement Thus, $3$ is not a solution of the given equation.