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

Referring to the picture below, which of these statements are true? Change in elevation from point A to B. The distance traveled from A to B along the straight
a form of government in which its citizens vote its leader. For Rome
PURRRRRRRRRRRRRRRRPURRRRRRRRRRRRRRRRRRPURRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRRR
The reproductive organs of the male The reproductive organs of the female are the The ovaries produce the The testes produce the Word Bank ovaries, testes, sp
Write the equation of a line that passes through point (-5,3) and is perpendicular to y=3/5x +2.
HIE YA HHHHHHHH111111111111 Use the calculator to fill in the table & graph for the equation y=3x - 2. 6 5 у 3 2 1 1 2 3 4 5 6 0 -6-5-4-3-2-1 -11 -2- -3 1 2
Should local police departments work with federal agencies to enforce immigration policies? Why or why not?
Pleaseeeee help me with this question
A total of 394 people got on a boat that already had 108 people on it. what is the best estimate for the total number of people on the boat?
how many liters of air pass through your lungs in an hour if each breath brings 1 liter of air into the body.