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Respuestas
Respuesta:
1. -2x + y = 8 -> -8x + 4y = 32
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-8x + 4y = 32
x - 4y = 5
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-7x = 37
x = -37/7
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-2(-37/7) + y = 8
74/7 + y = 8
y = 18/7
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2. 2x - 7y = 9 -> -10x + 35y = -45
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10x - 3y = 13
-10x + 35y = -45
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32y = -32
y = -1
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2x + 7 = 9
2x = 2
x = 1
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3. 4x + 3y = 10 -> 8x + 6y = 20
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8x + 6y = 20
5x - 6y = -7
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13x = 13
x = 1
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4 + 3y = 10
3y = 6
y = 2