: Offers PDF versions of the "Mordkovich & Tulchinskaya" control work collections.
: A motion or work-related problem requiring a system to solve. : Offers PDF versions of the "Mordkovich &
: Solving word problems (like the "two pipes filling a pool" classic) by constructing a system of equations as a mathematical model. Where to Find & Download : Offers PDF versions of the "Mordkovich &
: Isolating one variable and substituting it into the second equation. : Offers PDF versions of the "Mordkovich &
: Use variable replacement/substitution for higher-degree equations.