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

Data are drawn from a symmetric and bell shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. What
Historians of china have traditionally dated the beginning of Chinese civilization to the founding of the what??
what is the answer for (20,8),(9,16) ?
Data are drawn from a symmetric and bell shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. What
how is mass transit in cities a possible solution tk urban air pollution?
How were life forms affected by the rise in atmospheric oxygen levels that began 2.2 billion years ago?
Scarcity is the condition of not having enough goods and services to satisfy everyone's?
(10y^3+20y^2+55y)/5y
find an equivalent expression without parentheses -(50x-15y+15)=
Data are drawn from a symmetric and bell shaped distribution with a mean of 120 and a standard deviation of 5. There are 900 observations in the data set. What