Question

What does it mean for a number to be the "solution" to an equation?

Answer 1

To find the solution, usually means to find the unknown variable.

Answer 2

i.e. find the solution

x+2=4

x=4-2

x=2

Answer 3

A solution usually means its where the graph crosses the x axis.

Answer 4

not entirely, that is true only if solving for the variable of x in a cartesian plane.