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Sagot :
o + 3a = 7 ;
3o + 3a = 9 ;
____________(-)
-2o = -2;
o = $1;
3a = 6;
a = $2.
3o + 3a = 9 ;
____________(-)
-2o = -2;
o = $1;
3a = 6;
a = $2.
1r + 3a = 7
3r + 3a = 9
Then you can add or subtract these together . In this case we will subtract so we can remove the apples and get an answer for the oranges
(1r + 3a)-(3r+3a) = 7-9
-2r = -2
R = 1
So now by adding the value of r into one of the equations we can find the value for a
1r+3a=7
1+3a=7
3a = 6
A= 6/3
A= 2
3r + 3a = 9
Then you can add or subtract these together . In this case we will subtract so we can remove the apples and get an answer for the oranges
(1r + 3a)-(3r+3a) = 7-9
-2r = -2
R = 1
So now by adding the value of r into one of the equations we can find the value for a
1r+3a=7
1+3a=7
3a = 6
A= 6/3
A= 2
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