Question

resolva estas equações:

Answer 1

c)
2-3(y+2)=7-(y-2)
2-3y-6=7-y+2
-3y+y+y=7+2-2+6
-2y=13(-1)
2y=-13
$y = - \frac{13}{2}$


d)
5-(t+1)=7+2t
5+t-1=7+2t
t-2t=7-5+1
-t=3(-1)
t=3

e)
$\frac{x}{5} + 2 = 3(x - 9) + 1 \\ \frac{x}{5} + 2 = 3x - 27 + 1(5) \\ x + 10 = 15x - 135 + 5 \\ x - 15x = - 135 + 5 - 10 \\ - 14x = - 140 ( \div - 14) \\ x = 10$
f)
$\frac{3m}{2} + 1 = 8( m - 8) \\ \frac{3m}{2} + 1 = 8m - 64 ( \times 2) \\ 3m + 2 = 16m - 128 \\ 3m - 16m = - 128 - 2 \\ - 13m = - 130( \times - 13) \\ m = 10$