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

Help me with my math don't get it! ;(
Use C8H18 as the formula for gasoline and 0.71g/mL as its density. If a car gets 31.2 miles per gallon, what volume of CO2 measured at 28°C and 732 torr is prod
what is a reasonable estimate for this problem -98.6 divided by 3.8​
Ionic bonds result from elements_____.
Find the sum of the first 10 terms. 8,20,32,44,...
Which of the following statements about the water table is accurate?
Help! Need to do 1: a, b. What is marked. Thank you very much!
Prove that for all whole values of n the value of the expression: n(n–1)–(n+3)(n+2) is divisible by 6.
Find the value of the following expression: (2^8 ⋅ 5^−5 ⋅ 19^0)^−2 ⋅ 5 to the power of negative 2 over 2 to the power of 3, whole to the power of 4 ⋅ 2^28 Writ
Write the ordered pair that represents yz. Then find the magnitude of yz . y(-2,5),z(1,3)