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AsafeChristian
@AsafeChristian
December 2019
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Qual o valor de x-y,sabendo que x+y=7 e x2-y2=42
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leticiacoimbra0
X+y=7 x=7-y x= 7 - (-7)
2x - 2y = 42 x= 7 + 7
x= 14
2(7-y) - 2y = 42
14 - 2y - 2y= 42
-2y - 2y = 42 - 14
-4y=28
y= 28/-4
y= - 7
2 votes
Thanks 3
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2x - 2y = 42 x= 7 + 7
x= 14
2(7-y) - 2y = 42
14 - 2y - 2y= 42
-2y - 2y = 42 - 14
-4y=28
y= 28/-4
y= - 7