Danny56592
Danny56592 Danny56592
  • 16-02-2015
  • Mathematics
contestada

6x+7y=20
Y=2x
How do u solve this one ¿

Respuesta :

serdaryilmaz serdaryilmaz
  • 16-02-2015
if y=2x 
 7y=14x .

6x+14x=20
20x=20
x being 1 x=1

we found x .
and putting in this problem.

y=2x
y will be 2 , y=2

i am so sorry for my bad english :(
Answer Link
konrad509
konrad509 konrad509
  • 16-02-2015
[tex]6x+7y=20\\ y=2x\\\\ 6x+7\cdot2x=20\\ 6x+14x=20\\ 20x=20\\\\ x=1\\\\ y=2\cdot1\\ y=2\\\\ \boxed{(x,y)=(1,2)} [/tex]
Answer Link

Otras preguntas

Find the ninth term of the following geometric sequence
1) If sin alpha = -4/5, and cos alpha>0, find tan alpha and sec alpha. 2) If cot x = -3/2 and sec x<0, find sin x and cos x. 3) If cos theta = 0.54, find
What did the laputans’ clothes look like
Question 1 (1 point) Question 1 Unsaved ¿Cuál palabra es el pronombre correcto para las palabras subrayadas? - Mi hermana come pizza. Question 1 o
Based on the laws of inheritance, what is the probability that a gamete will end up with a mutated chromosome to be passed on to offspring?
Line l and Line m are parallel lines that have been reflected across the x-axis;. The resulting images are show as l' and m'. How can you describe l' and m'?
Jamar is finding the selling price of a pair of $40 skates with 30% markup. Find his mistake and correct it.
If 100c2 has value of 4,950
Jonah tore the angles off a large paper triangle. Then he arranged the three paper angles with their points together so that there were no gaps and no overlaps.
I do not know everything; still many things i understand. german