yashvinappadoo
yashvinappadoo yashvinappadoo
  • 02-01-2016
  • Mathematics
contestada

solve the simultaneous equations
3x-y=18
2x+y=7
answer x=
y=

Respuesta :

Billymkhoi
Billymkhoi Billymkhoi
  • 02-01-2016
3x -y= 18 (1)
2x +y = 7 (2)

Take (1)+ (2):
(3x+2x)+ (-y+y)= 18+7
⇒ 5x = 25
⇒ x= 25/5
⇒ x=5

Use (2) to find y:
2*5+y= 7
⇒ 10+y=7
⇒ (10-10)+y= 7-10
⇒ y = -3

Final answer:
x=5, y=-3.

Hope this helps~

Answer Link

Otras preguntas

Select examples of software Mouse Computer programs Applications Monitor Photo editing program
See Chapter 19, sections 19.9 and Cases. The project will be a continuation of how to improve the process you chose in Competency 1. Apply project management to
Imagine cashing or taking money using the Automated Teller Machine (ATM) and the banking hall, which of these two ways would you prefer. Classified the two ways
The communist countries of North Korea and Cuba are suffering from severe economic problems
Algorithm to find odd integers between 1 and49 ​
3. What was the status of women in Trojan society? What was their role in the family and during war?
Which of the following statements is true?
What is the main difference between the null and the research hypothesis? What is the importance of assuming the null hypothesis is true?
what is processing device? write the name of processing devices​
What volume of a 3.95 M potassium chloride solution would be needed to make 325 mL of a 2.76 M solution by dilution? [?] mL of 3.95 M KCl