Question

resolva as equações do 1 grau a)5x+18=33 b)10x+21-7=10+8x c)-5x=9x+24 d)7x-29=13 e)4x+10=45-3x​

Answer 1

Resposta:

a)5x+18=33

$5x = 33 - 18 \\ 5x = 15 \div (5) \\ x = 3$

b)10x+21-7=10+8x

$10x + 14 - 10 - 8x = 0 \\ 2x + 4 = 0 \\ 2x = - 4 \div (2) \\ x = - 2$

c)-5x=9x+24

$- 5x - 9x - 24 = 0 \\ - 14x - 2 4 = 0 \\ - 14x = - 24 \times ( - 1) \\ 14x = 24 \div (2) \\ 7x = 12 \\ \\ x = \frac{12}{7}$

d)7x-29=13

$7x - 29 - 13 = 0 \\ 7x - 42 = 0 \\ 7x = 42 \div (7) \\ x = 6$

e)4x+10=45-3x

$4x + 10 - 45 + 3x = 0 \\ 7x - 35 = 0 \\ 7x = 35 \div (7) \\ x = 5$