Question

Resolva as seguinte equação do 1grau a)7×+80=4×-7 (b)9×-4×+10=7×-30 (c)4×+2=16

Answer 1

Resposta:

$a)7x + 80 = 4x - 7 \\ 7x - 4x = - 7 - 80 \\ 3x = - 87 \\ x = \frac{ - 87}{3} \\ x = - 29 \\ \\ b)9x - 4x + 10 = 7x - 30 \\ 9x - 4x - 7x = - 30 - 10 \ \\ -2x = - 40 \\ x = \frac{ - 40}{ - 2} \\ x = 20$

$c)4x + 2 = 16 \\ 4x = 16 - 2 \\ 4x = 14 \\ x = \frac{14}{4}$