yashvinappadoo yashvinappadoo

02-01-2016
Mathematics

contestada

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

Respuesta :

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

What did the Romans call Scotland?

Describe the relationship between the different levels of legislation most relevant to the Correctional environment. Refer to both primary and secondary legisla

Put this equation into slope- intercept form. 5x – 4y = 12

help help help help help

6. Is it healthy to restrict processed foods? Why or why not?

14. (08.03 LC) During the Civil War, all of the battles and most of the population of Florida were A in the interior of the state B in the north of the state C

48 divided by 76.8 I am very confused on the two digits numbers

Everyone went on the field trip except Jackie and ______.A.MeB. IC. SheD.Myself

Why are the one called organisms not shown

help help help help help