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

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

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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
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