lorenamerino628 lorenamerino628
  • 01-12-2020
  • Mathematics
contestada

If 3x - 9y = 21 and 6x + 3y = 21, which of these could be a value of x or y? Select all that apply.

Respuesta :

nopolca nopolca
  • 01-12-2020

Answer:

x = 4

y = -1

Step-by-step explanation:

3x-9y = 21

6x+3y =21

-2* (3x-9y) = -2*(21)

6x+3y = 21

-6x+18y = -42

6x+ 3y =   21

-6x+6x+18y+3y = -21

21y = -21

y --21/21

y = -1

3x-9y =21

3x - 9*(-1) = 21

3x + 9 =21

3x = 21-9

3x = 12

x = 12/3

x = 4

Answer Link

Otras preguntas

Bhim Prasad borrowed Rs. 99,000 from a bank at the rate of 8% p.a?​
write an informal letter to your friend studying outside Nigeria telling her some of the problems you are facing and asking her for solution on how to solve the
An electron starting from rest, is accelerated by a uniform field of magnitude 175 N/C. Through what distance, in meters, has the electron traveled when its kin
What is the "Cornucopia"? Why is it important?
In ΔEFG, g = 1.6 cm, e = 8 cm and ∠F=46°. Find ∠E, to the nearest 10th of a degree.
Fully simplify 6m+2-2m+3
a principal amount of $1100 is placed into a savings account with a APR of 2.55% simple interest for 10 years
(x-20)²=x²-20 show your working out
4 3/4+ 7 2/5 simplified
Which of these fats would be the BEST choice to add to her diet?