The equations of both the sister are the same.
In mathematics, an expression is defined as a set of numbers, variables, and mathematical operations that are formed according to rules which are dependent on the context.
Gabriel Equation: [tex]2.5x+2y-2[/tex],
Gabriel's Sister Equation: [tex]x+x+0.5x+y+y-2[/tex],
On further solving the equation we get,
[tex]x+x+0.5x+y+y-2\\=2.5x + 2y-2[/tex]
As we can see the equation transformed to Gabriel's Equation of total cost.
Therefore, both the sisters are correct as the equations of both the sister are the same.
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