philly philly
  • 03-11-2014
  • Mathematics
contestada

x-5y=2 and 9x+8=15 solve by substitution

Respuesta :

CSM
CSM CSM
  • 03-11-2014
[tex]x-5y=2[/tex]
Hence [tex]x=2+5y[/tex]   (Equation I)
[tex]9x+8=15[/tex]             (Equation II)
Substituting Equation I in Equation II
[tex]9(2+5y)+8=15[/tex]
[tex]18+45y+8=15[/tex]
[tex]26+45y=15[/tex]
[tex]45y=-11[/tex]
Hence [tex]y= - \frac{11}{45} [/tex]

Substituting this in Equation in I to get X

[tex]x-5(- \frac{11}{45} )=2[/tex]
[tex]x+ \frac{11}{9}=2 [/tex]
[tex]x= 2- \frac{11}{9} [/tex]
[tex]x= \frac{17}{9} [/tex]
Answer Link

Otras preguntas

now a days water management is very essential write your opinion on this​
2. Write the definition of Article with example.
Acellus Business Math Question! ​
El invierno que viene Ricardo Rojas Response area dos semanas de vacaciones. El y su familia Response area un viaje a Panama. Alli ellos podrán pasar unos dias
how to get 85% of 1600
Please HELP! Select a figure from the options which continues the same series as shown by the problem figures. I need answer please.
how to get 85% of 1600
what is the capital city of japan?​
HELP PLEASE! Select a figure from the options which will continue the same series as established by the problem figures.Please answer somebody! Need answer.
The scale ratio on Emily’s map of jogging is 1:50 000. She chooses a route approximately 12cm long on the map. How far is she planning to jog?