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Volrs148
@Volrs148
October 2019
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Qual a solução do sistema 2x+2y=9
4x-5y=7
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exalunosp
2x + 2y = 9 ( vezes - 2 para eliminar x)
4x - 5y = 7
--------------------
-4x - 4y = - 18
4x - 5y = 7
----------------------
// - 9y = - 11
9y = 11
y = 11/9 ****
2x +2 ( 11/9) = 9
2x + 22/9 = 9/1
2x = 9/1 - 22/9
2x = ( 81 - 22)/9
2x =59/9
x =59/9 : 2/1 ou 59/9 * 1/2 = 59/18 ***
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4x - 5y = 7
--------------------
-4x - 4y = - 18
4x - 5y = 7
----------------------
// - 9y = - 11
9y = 11
y = 11/9 ****
2x +2 ( 11/9) = 9
2x + 22/9 = 9/1
2x = 9/1 - 22/9
2x = ( 81 - 22)/9
2x =59/9
x =59/9 : 2/1 ou 59/9 * 1/2 = 59/18 ***