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 $199.99 game console Amy purchased was on sale for 10% off. What amount did Amy get off the price?
A single carbon atom can form a maximum of how many single covalent bonds
The 9:3:3:1 ratio of the offspring in Gregor Mendel’s dihybrid crosses led him to conclude that _____________________________. 1)some of the alleles were more a
can you express 9/9 as a mixed number why or why not
Derive the equation of the parabola with a focus at (−5, 5) and a directrix of y = -1.
how was life before the industrial revolution different from the life after it
Three More Than Eight Times A Number Is Equal To 19
Help please! My maths unfortunately... Does anyone know how I would answer this? I just simply do not know what 'describe each reflection' means. Erm? The shape
what is 25/1000 reduced
In what ways did the British treat the patriots harshly? was this a good idea or a bad idea? why? (Subject- Social Studies on the South Carolina Battles) 15 poi