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

if a=2,c=4 e=-6 then 3a-3(2c-e)
A scientist observes a natural spring and measures its depth. What type of data was collected? A. qualitative B. independent C. quantitative D. aver
A tour bus travels 2,160 miles in 36 hours. what happened the average distance the bus travels in one hour?
write a decimal that is 1/10 of 3.0.
Once you've saved a block of text or graphics for easy insertion in other documents you'll see it in the
it is recommended that an adult drink 64 fluid ounces of water every day. josey has already consumed 700 milliliters of water. How many more liters should he dr
Babylonian method to approximate square root of 19
When electrons are shared, the type of bonding is called?
During a black Friday sale, Alberto paid 158.00 for a cell phone that was reduced by 30%. What was the original price of the smart phone? Please explain how to
The feeling of fervent devotion toward one’s nation above all others is known as?