# How do you evaluate 3x+4 for x=3?

Apr 22, 2016

$3 x + 4 = 3 \times 3 + 4 = 13$
just substitute $x$ for $3$ in this linear equation, as
$3 \cdot x + 4 = 3 \cdot 3 + 4 = 9 + 4 = 13$