anonymous
  • anonymous
solving systems of equations by elimination -x + 9y = -5 x - 5y = 1
Pre-Algebra
schrodinger
  • schrodinger
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haleyelizabeth2017
  • haleyelizabeth2017
Add the second equation to the first equation to get 4y=-4
haleyelizabeth2017
  • haleyelizabeth2017
Then, divide -4 by 4 to get y=-1. Plug in -1 for y into either equation and solve for x.
haleyelizabeth2017
  • haleyelizabeth2017
x-5y=1 x-5(-1)=1 x+5=1 x=-4

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haleyelizabeth2017
  • haleyelizabeth2017
Then plug x and y back into either equation to check your answer.
anonymous
  • anonymous
do i add or subtract them
haleyelizabeth2017
  • haleyelizabeth2017
add :)
anonymous
  • anonymous
ty :D
haleyelizabeth2017
  • haleyelizabeth2017
No problem!
anonymous
  • anonymous
-4+-1
anonymous
  • anonymous
with will be -5
anonymous
  • anonymous
whitch*
haleyelizabeth2017
  • haleyelizabeth2017
Wait..
haleyelizabeth2017
  • haleyelizabeth2017
-(-4) + 9(-1) = -5 (-4) - 5(-1) = 1 Plug them into these equations to check
anonymous
  • anonymous
omg im new too this subject lol like ugh
haleyelizabeth2017
  • haleyelizabeth2017
haha don't worry about it, you'll get the hang of it!
haleyelizabeth2017
  • haleyelizabeth2017
just know...the solution would be (-4, -1)
anonymous
  • anonymous
for the answer right ill let you kno if i need help on the next one
haleyelizabeth2017
  • haleyelizabeth2017
Okay
haleyelizabeth2017
  • haleyelizabeth2017
Did you understand how I got that?
anonymous
  • anonymous
thanks again
haleyelizabeth2017
  • haleyelizabeth2017
No problem!
anonymous
  • anonymous
y = 2/3x-1 y=3
anonymous
  • anonymous
y = 2/3x-1 y=3
haleyelizabeth2017
  • haleyelizabeth2017
are those the two equations given?
anonymous
  • anonymous
yes
haleyelizabeth2017
  • haleyelizabeth2017
okay, so 3=2/3x-1 y is given so we have (_, 3) so far.
anonymous
  • anonymous
ok
haleyelizabeth2017
  • haleyelizabeth2017
3+1=2/3x 4=2/3x 4*3/2=x x=6 so (6, 3) :)
anonymous
  • anonymous
THANKS!
haleyelizabeth2017
  • haleyelizabeth2017
No problem!
anonymous
  • anonymous
8 more to go idk if you going to help me with all this lmao

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