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

What was significant about the election of 1828

Because of uncertainty about future inflation, the union devotes a large quantity of resources to monitoring inflation indicators in order to maximize its finan

Last question :) Correct answer will get brainliest and full ratings !

The ration of the length of a rectangle to its width is 7:4. if the perimeter of the rectangle is 44 centimeters, find its area

When a nation's trading ability declines: answers : a.it often resorts to raiding. b.people blame the leaders. c.it is because it becomes overconfident and a

In complete sentences, explain how can seven trees be planted so that there are six rows of trees in a straight line with each row having three trees?

What were some of the dangers and consequences that Portuguese sailors might have worried about when setting off on a journey along the west coast of Africa in

my expectation from my teacher.

which statement is used to prove that angle PTR is always equal to angle STQ?Lines PQ and RS do not have a fixed length.Angle PTR and angle PTS are supplementar

1. Change each fraction to a percent. a. 6/100 b. 3/8 c. 357/100 d. 100/100