That one.
square
the square
It's a trap.
I believe this question refers to the fact that the partial differential equation that describes heat transfer is classified as a parabolic equation. So you would see these two terms together when people talk about the "parabolic heat equation" (meaning the heat equation, which is a parabolic equation): <math>u_t = k(u_{xx} + u_{yy} + u_{zz})</math>
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Assuming that the 2 in "5x2" is a power (5x2), then no, this is not a linear equation. It is a parabolic equation.
The parabolic heat equation is a partial differential equation that models the diffusion of heat (i.e. temperature) through a medium through time. More information, including a spreadsheet to solve the heat equation in Excel, is given at the related link.
An equation that is simplified to 0 0 is called a perfect equation. It usually have exactly one solution.
It is not an equation because it has no equality sign but it is an expression that can be simplified as: 67+a
Bar graphs and line graphs do not. Straight line, parabolic, and hyperbolic graphs are graphs of an equation.
The parabolic heat equation is a partial differential equation that models the diffusion of heat (i.e. temperature) through a medium through time. More information, including a spreadsheet to solve the heat equation in Excel, is given at the related link.