Can you figure out how many there are of each animal? But another, more sophisticated, way to proceed is to create a matrix whose entries are the coefficients of the equations. The three equations ...

Partial differential equations (PDEs) are a class of mathematical problems that represent the interplay of multiple variables ...

The golden rule when solving an equation is to always repeat what you do to one side of the = sign on the other side. The idea is frequently referred to as "change the side, change the sign" or ...