Question

a)x=1,para 3×+5=-8
b)x=-1,para 3x-1=2

Answer 1

$3x + 5 = - 8 \\ 3 \times 1 + 5 = - 8 \\ 3 + 5 = - 8 \\ 8 = - 8 \: \: \: falso$
$3x - 1 = 2 \\ 3 \times ( - 1) - 1 = 2 \\ - 3 - 1 = 2 \\ - 4 = 2 \: \: \: \: \: falso$