Consider the simultaneous equations: cases 2x + y = 6 4x - y = 15 cases The solution is ,

MATHEMATICS · Multi-part · AoPS · Mathematics · Multi-Variable Linear Equations · Multi-Variable Linear Equations

Problem

Consider the simultaneous equations:

\begin{cases} 2x + y = 6 \\ 4x - y = 15 \end{cases}

The solution is

x = 3.5

y = -1

. Discuss whether this solution might be reasonable if

x

represents: (1) an amount of money (2) the number of cups of flour in a recipe (3) the number of people in a class.