-3x-6y=21 3x-6y=-9 System Of Elimination - Only Need Steps . Thanks

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-3x-6y=21 3x-6y=-9 System Of Elimination - Only Need Steps . Thanks

Mathematics
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-5,-1
the x's with the x's and the y's with the y's
What Are You Asking ?? I Gave You The Answer.

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Other answers:

And I Did That
Lyan Help Please .
note: by adding the 2 equations we eliminate the x term...
Ok
so |dw:1439780091924:dw| please simplify what do we have?
whats -6y-6y=? whats 21-9=?
-12y=12
good now we need the y variable by itself... but right now -12 is being multiplied to y (-12y)... how can we get y alone? do u know?
Divide
good so|dw:1439780478252:dw|
0
no if we divide 1/1 we get 1 so any # divided by itself is 1 ..but noted the negative....
Whats Being Divided By One Up There
|dw:1439780655225:dw|
ok
12/-12 =0
1 divided by 1= 1 2 divided by 2= 1 3 divided by 3 =1 ....
\(\dfrac{12}{12} = 1\) \(\dfrac{Dog}{Dog} = 1\) \(\dfrac{Pittsburgh}{Pittsburgh} = 1\)
^ oooohhh i get it now
so whats y=? note the negative sign..
-1
good now since we have y=-1 we can now find the value of x by? u have any idea? ...
how to find that...
Add -1 To The Equations
no we can substitute the value of y=-1 into the given equations... equation 1 or equation 2 it doesnt matter..u will be given the same result of x..
ok
so using equation 1 |dw:1439781130011:dw|
whats (-6)*(-1)=?
whats negative 6 times negative 1 =?
-6
a negative # time a negative #= a positive #
oh yea
so ....
6
|dw:1439781539647:dw| now we need to get x on one side of the equation alone...to do that we can subtract 6 to both sides of the equation...
|dw:1439781655064:dw|
DIVIDE 3X FROM BOTH SIDES OF THE EQUATION
no we subtract 6 from both sides of the equation leaving |dw:1439781779950:dw| whats 21-6=?
15
ok good can you by using draw' show me the next step |dw:1439781903092:dw|
|dw:1439781938626:dw|
|dw:1439774773769:dw|
no... we can divide by x ... we need x to be alone on one side of the equation ..
|dw:1439782133454:dw|
|dw:1439782193901:dw|
note the negative sign...
-5
correct
now we can do a check to make sure thats our solution by simply substituting the values we just find into the given equation so... |dw:1439782336135:dw|
Yay ! Lol
ok
any question?
No Thanks
ok welcome

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