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Anexos:
peytonhp:
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Respostas
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Explicação passo-a-passo:
a)
4x - 1y = 2
3x + 2y = 7
-y = 2 - 4x
y = (2 - 4x)/(-1)
3x + 2(2 - 4x)/(-1) = 7
3x + (4 - 8x)/(-1) = 7
-3x + 4 - 8x = -7
-11x = -11
x = 1
y = (2 -4 . 1) / (-1)
y = (2 - 4) / (-1)
y = -2/(-1)
y = 2
b)
x + y = 1
x - 2y = 1
y = 1 - x
y = (1 - x)
x - 2(1 - 1x) = 1
x + (-2 + 2x) = 1
x - 2 + 2x = 1
3x = 3
x = 1
y = (1 -1 . 1)
y = (1 - 1)
y = 0
c)
5x - 2y = 1
2x + y = 4
-2y = 1 - 5x
y = (1 - 5x)/(-2)
2x + 1(1 - 5x)/(-2) = 4
2x + (1 - 5x)/(-2) = 4
-4x + 1 - 5x = -8
-9x = -9
x = 1
y = (1 -5 . 1) / (-2)
y = (1 - 5) / (-2)
y = -4/(-2)
y = 2
d)
2x - 4y = -2
5x - 3y = 2
-4y = -2 - 2x
y = (-2 - 2x)/(-4)
5x - 3(-2 - 2x)/(-4) = 2
5x + (6 + 6x)/(-4) = 2
-20x + 6 + 6x = -8
-14x = -14
x = 1
y = (-2 -2 . 1) / (-4)
y = (-2 - 2) / (-4)
y = -4/(-4)
y = 1
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