Question

{x-y= -1}
{2x-3y= -10}


{x-y=0}
{x+y=4}

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Answer 1

Resposta:

1) x = 7, y = 8

2) x = 2, y = 2

Explicação passo a passo:

x -y= -1

x = y - 1

2x-3y = -10

2(y-1)-3y = -10

2y - 2 - 3y = -10

-y = 2 - 10

-y = -8 => y = 8

x = y - 1 => x = 8 - 1 = 7

x-y=0

x=y

x+y=4

x+x = 4

2x=4 => x =4/2 = 2

y = x => y = 2