Question

Resolva as equações : A-) x/2+3x/5=1. B-) 3y+4y/7-2 =48. C-) N/3 -8 = 7N/12 46 ME AJUDEM PRVR!!!!!!​

Answer 1

A-1

$\frac{x}{2} + \frac{3x}{5} = </strong><strong>5</strong><strong> \\ \frac{5x + 6x}{10} = </strong><strong>5</strong><strong> \\ \frac{11x}{10} = </strong><strong>5</strong><strong> \\ 11x = </strong><strong>5</strong><strong>0 \\ x = \frac{</strong><strong>5</strong><strong>0</strong><strong>}{11}$

B-

$\frac{3y + 4y}{7 - 2} = 48 \\ \frac{7y}{5} = 48 \\ 7y = 240 \\ y = \frac{240}{7}$

C-

$\frac{n}{3} - 8 = \frac{7n}{12} \\ \frac{n - 8}{3} = \frac{7n}{12} \\ 12n - 96 = 21n \\ 12n - 21n = 96 \\ - 9n = 96 \\ - n = \frac{96}{9} ( - 1) \\ n = \frac{ - 96}{9}$