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

Does the phrase "dives below the surface of the ocean" represent a positive or negative number? a) Positive b) Negative c) Neither d) Both
what does the phrase lonely no longer in paragraph 3 suggest about the narrators smotional state
How to find the gradient and where the line crosses the y axis
64 A C D E B 32 117 Angle puzzle
is the established of a national bank constitutional why or why not
Mai, Andre, and Lin are discussing the volume of a scaled box. The orginal box holds 7 cubic inches. The new box holds 448 cubic inches. Mai thinks the scale fa
what percentage is 8 times more
what treatment can help cure lymphomia? and what are the symtoms of these treatments
Which expression is equivalent to 1,000 + 196 A. 10² + 7 • 28 B. 10³ + 14² C. 100³ + 7 • 28 D. 100² + 14²
how to graph this equation