Question

preciso urgenteeeeee​

Answer 1

Resposta:

a)

$2x - 15 = 3 \\ 2x = 3 + 15 \\ 2x = 18 \\ x = \frac{18}{2} \\ x = 9$

b)

$3x + 1 = 10 \\ 3x = 9 \\ x = \frac{9}{3} \\ x = 3$

c)

$2b - 6 = 15 \\ 2b = 15 + 6 \\ b = \frac{21}{2}$

d)

$4m - 7 = 2m - 8 \\ 4m - 2m = - 8 + 7 \\ 2m = - 1 \\ m \frac{ - 1}{2}$

e)

$5y - 2 + 12 = 6y + 4 \\ 5y - 6y = 4 + 2 - 12 \\ - y = - 6 \\ y = 6$

f)

$m = - 3(m - 4) \\ = - 3m + 12 \\ m + 3m = 12 \\ 4m = 12 \\ m = \frac{12}{4} \\ m = 3$

g)[tex]2x + 4 = 12 \\ 2x = 12 - 4 \\ 2x = 8 \\ x = \frac{8}{2} \\ x = 4[/tex]

h)[tex]2y + 10 = - 3y + 15 \\ 2y + 3y = 15 - 10 \\ 5y = 5 \\ y = 1[/tex]

i)[tex]\frac{x}{2} - 5 = 6 \\ \frac{x}{2} = 6 + 5 \\ \frac{x}{2} = 11 \\ x = \frac{11}{2}[/tex]

j) 10-5, 10×2, 10÷3