boujeekeke boujeekeke
  • 04-02-2017
  • Mathematics
contestada

how to solve 4y=x 3x- y=70 using substitution

Respuesta :

iloram
iloram iloram
  • 05-02-2017
x = 4y
3x - y = 70

substitute the x in the second equation with the other half of the first equation.

3(4y) - y = 70
12y - y = 70
11y = 70
y = 6.36 repeating, or 6 4/11

now use this to solve first equation
x = 4 (6 4/11)
x = 25.45 repeating

done
Answer Link

Otras preguntas

Log (10-4x) = log (10-3x)
What is the name of the Speaker of the House of Representatives now?
A 1-gram sample or a compound is added to 100 grams of H2O(l) and the resulting mixture is then thoroughly stirred. Some of the compound is then separated from
Which property is a measure of the average kinetic energy of the particles in a sample or matter? (1) mass (2) density (3) pressure (4) temperatu
What group of people was taken to America and sold as slaves?
Name one U.S. territory
Which reaction is single replacement? (1) 2H2O2 --> 2H2O + O2 (2) 2H2 + O2 --> 2H2O (3) H2SO4 + Mg --> H2 + MgSO4 (4) HCl + KOH --> KCl + H2O
What is one promise you make when you become a United States citizen?
What are two Cabinet-level positions?
Two forms of solid carbon, diamond and graphite, differ in their physical properties due to the differences in their (1) atomic numbers (2) crystal structures (