$1$

$2$

$3$

$4$

$5$

$6$

$7$

$2$x speed

x $=5$

x

y

y $=$ x

z $=$ x $+2$

x $=3$

z

x $+$ y $=5$

x $*$ y $=6$

Algebra

x $=2$

y $=3$

Programming

$5$

$5$

$7$

$3$

$5$

In programming, a variable is a place to hold a value. Here, variables x$,$ y$,$ and z are depicted graphically as boxes.