athenacamacho5305 athenacamacho5305
  • 01-06-2020
  • Mathematics
contestada

i’m confused on this answer anyone know it?

im confused on this answer anyone know it class=

Respuesta :

ranau1199
ranau1199 ranau1199
  • 01-06-2020

Answer:

[tex]y=\frac{26}{7},\:x=-\frac{15}{7}[/tex]

Step-by-step explanation:

[tex]\begin{bmatrix}4x+5y=10\\ -2x+y=8\end{bmatrix}\\\\\begin{bmatrix}-2\cdot \frac{10-5y}{4}+y=8\end{bmatrix}\\\\[/tex]

[tex]-5+\frac{7y}{2}=8\\\\\mathrm{Multiply\:both\:sides\:by\:}2\\-5\cdot \:2+\frac{7y}{2}\cdot \:2=8\cdot \:2\\-10+7y=16\\y=\frac{26}{7}\\[/tex]

[tex]\mathrm{For\:}x=\frac{10-5y}{4}\\\mathrm{Subsititute\:}y=\frac{26}{7}\\x=\frac{10-5\cdot \frac{26}{7}}{4}\\\\[/tex]

[tex]x=-\frac{15}{7}\\[/tex]

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