Question

me ajudem pfvr urgente​

Answer 1

Resposta:

A)

$x + y = 11(x = x + 11) \\ x - y = 3 \\ x - y + x + 11 = 3 \\ y = 3 - 11 \\ y = - 8 \\ y = - 8 \div y \\ y = - 8 \\ \\ x + x + 11 + y - 8 = 11 \\ 3x = 11 + 8 - 11 \\ 3x = 8 \\ x = 3 \div 8 \\ x = 2.6$

S={-8,2,6}

b)

$x - y = 16 \\ x + y = 74(x = x + 74$

$x - y = 16 \\ x - y + x + 74 = 16 \\ y = 16 - 74 \\ y = - 58 \\ y = - 58 \div y \\ y = - 58$

$x + y + x + 74 - 58 = 74 \\ 3x = 74 + 58 - 74 \\ 3x = 58 \\ x = 58 \div 3 \\ x = 19.3$

S= {-58,19,3}