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

can someone please help me?
Trong các quá trình nén xảy ra trong máy nén piston , quá trình nén nào có công của máy nén là nhỏ nhất và lớn nhất ?
Oxide is a combination of oxygen and another element. So is Water an oxide?
alguien que me pueda ayudar a hacer mi tarea !!!!d. En la granja de Don José debe entregar 325, 56 Kg de maiz para alimenter sus animales, pero recibieron ¿cuán
How far is the moon from the sun?
2. What weakness and what strength is coronavirus exposing our society ?
Directions - Write an equation in Slope-Intercept Form (y = mx + b) for the line with the given slope (m) and y-intercept (b). ​m = \frac{1}{2} 2 1 ​ , b = 8
Select the correct answer. What is the best way to describe a theme of this poem? A. The main purpose of having New Year's resolutions is to make people feel ba
Analyze the diagram below and complete the instructions that follow. 10 6 B. 'C С 8 Find sin ZA A 3 5 B. 4 C 1
Do you think Ming rulers should have ended the voyages of Zheng He? Write a 75- to 100-word paragraph to explain your opinion.PLLSS Help For test.