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

What is a couplet? Repetition of the initial sound in nearby words Rhyming words at the end of two consecutive lines Rhyming words are placed in the middle of a
help please!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
Is 1.027 5 greater than 1.029
A piggy bank contains quarters and dollar bills. There is at least $18 in the piggy bank and at least 20 quarters. Which of the following systems correctly des
State two non-sexual methods one can contract HIV. Next, state two methods HIV cannot be transmitted.
Modern : antiquated :: weak :
statistics question- please help and show work.
divide the decimal numbers:12.012÷6
Kelly and Daniel wrote the following proofs to prove that vertical angles are congruent. Who is correct? Kelly is correct, but Daniel is not. Neither Kelly o
Generate the first 5 terms of this sequence: f(1) = 2 and f(2) = 3, f(n) = f(n - 1) + f(n - 2), for n > 2. A.2, 3, 5, 7, 9 B.2, 3, 4, 7, 11 C.2, 3