Gente como faço esses sistemas 3x-y=10 x+y=18
x+y=7 x-y=1
x=2y 2x-5y=3
5x-3y=15 2x+3y=6
EmersonOSilva:
A questão os coloca dessa forma? Ou falta organização?
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a)
3x-y=10
x+y=18
4x = 28 ==. x = 7
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x + y = 18 ==> y = 18 - x ==> y = 18 - 7 ==> y = 11
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b) x+y=7
x-y=1
2x = 8 ==> x = 4
x + y = 7 ==> y = 7 - x ==> y = 7 - 4 ==> y = 3
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c) x=2y
2x-5y=3
2(2y) - 5y = 3 ==> 4y-5y = 3 ==. -y = 3(-1) ==> y = - 3
x = 2y ==> x = 2(-3) ==> x = - 6
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D) 5x-3y=15
2x+3y=6
7x = 21 ==> x = 3
3y = 6 -2x ==> 2x = 6-2(3) ==> 3y = 6 - 6 ==> y = 0
=======================================================
3x-y=10
x+y=18
4x = 28 ==. x = 7
=============================================
x + y = 18 ==> y = 18 - x ==> y = 18 - 7 ==> y = 11
=========================================================
b) x+y=7
x-y=1
2x = 8 ==> x = 4
x + y = 7 ==> y = 7 - x ==> y = 7 - 4 ==> y = 3
=========================================================
c) x=2y
2x-5y=3
2(2y) - 5y = 3 ==> 4y-5y = 3 ==. -y = 3(-1) ==> y = - 3
x = 2y ==> x = 2(-3) ==> x = - 6
=======================================================
D) 5x-3y=15
2x+3y=6
7x = 21 ==> x = 3
3y = 6 -2x ==> 2x = 6-2(3) ==> 3y = 6 - 6 ==> y = 0
=======================================================
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