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

Eye protection is particularly important for children who spend all day on the water or at the beach. Since the glare is intense. What is the BEST way to combin
Which statement accurately describes the Romantic movement? A. Romanticism embraced the ideas of the Enlightenment. B. Romanticism looked for truth in nature
are these equivalent or not? 2.5(3+x) and 2.5x+7.5
a die with 8 sides is rolled.what is the probability of rolling a number less than 7
Which statement is scientifically based? A).Mutations rarely occur. B).All mutations are harmful. C).Some mutations can be contagious, like infections. D).Mutat
what is equal to 2/3
x^5(1-x)^6 How to find the critical points
a rectangular bedroom floor has an area of 100 square feet and a length of 10 feet what is the perimeter of the floor
What is the difference in the place value between the 2 in 324 and the 2 in 0.324?
Please help, no just giving answer for points please :) Which sentence uses quotation marks correctly? A. When in France, my mother and I visited the Rodin Mu