Resolución
[tex]\begin{bmatrix}x+y=50\\ 1,25x+1,50y=69,25\end{bmatrix}[/tex]
Despejamos "x"
[tex]x=50-y[/tex]
Reemplazamos
[tex]1,25(50-y)+1,50y=69,25[/tex]
[tex]1.25\left(50-y\right)\cdot \:100+1.5y\cdot \:100=69.25\cdot \:100[/tex]
[tex]125\left(50-y\right)+150y=6925[/tex]
[tex]6250-125y+150y=6925[/tex]
[tex]6250+25y=6925[/tex]
[tex]25y=6925-6250[/tex]
[tex]25y=675[/tex]
[tex]y=\frac{675}{25}[/tex]
[tex]y=27[/tex]
Entonces compro 27 yogurt
Ahora despejamos "x"
[tex]x=50-27[/tex]
[tex]x=23[/tex]
Entonces compro 23 refrescos
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Resolución
[tex]\begin{bmatrix}x+y=50\\ 1,25x+1,50y=69,25\end{bmatrix}[/tex]
Despejamos "x"
[tex]x=50-y[/tex]
Reemplazamos
[tex]1,25(50-y)+1,50y=69,25[/tex]
[tex]1.25\left(50-y\right)\cdot \:100+1.5y\cdot \:100=69.25\cdot \:100[/tex]
[tex]125\left(50-y\right)+150y=6925[/tex]
[tex]6250-125y+150y=6925[/tex]
[tex]6250+25y=6925[/tex]
[tex]25y=6925-6250[/tex]
[tex]25y=675[/tex]
[tex]y=\frac{675}{25}[/tex]
[tex]y=27[/tex]
Entonces compro 27 yogurt
Ahora despejamos "x"
[tex]x=50-y[/tex]
[tex]x=50-27[/tex]
[tex]x=23[/tex]
Entonces compro 23 refrescos
R = Marta compro 23 refrescos y 27 yogurt