allylollopez2230
allylollopez2230 allylollopez2230
  • 04-02-2021
  • Mathematics
contestada

Solve the system of linear equations by substitution. y=−3x−7 y=x+9

Respuesta :

arisgryphon
arisgryphon arisgryphon
  • 04-02-2021
x+9=-3x-7

add 7 to both sides

x+16=-3x

subtract 1x from both sides

16=-4x

divide both sides by -4

-4=x

y=x+9

y=-4+9

y=5

check:

5=-3(-4)-7

5=12-7

5=5

so

x=-4

y=5
Answer Link

Otras preguntas

The process by which molecules of water vapor in the air become liquid water answers
We have found the least squares line for predicting coral growth y from mean sea surface temperature x to be y = 11.6921 − 0.30305x. (a) use the equation to obt
What is a more positive word for argument
How many sarcomeres are in a muscle cell?
The process by which molecules of water vapor in the air become liquid water answers
One pound of swordfish costs as much as 1.5 pounds of salmon. Mrs. O pays $39 for 2 pounds of salmon and 3 pounds of swordfish. Find the ratio of the amount of
From My Bondage and My Freedom by Frederick Douglass Once awakened by the silver trump of knowledge, my spirit was roused to eternal wakefulness. Liberty! the i
Each of the following is an appropriate question that a writer might ask during the revision stage EXCEPT: A. Are my ideas in logical order and organized effec
Ron lost 10 points seven times playing a video game he then lost an additional 100 points for going over the time limit what was the total change in his score
The USA PATRIOT Act (reauthorized by Congress in 2006 with a few changes), the Foreign Intelligence Surveillance Act of 2008, and actions carried out by the Na