Question

a) 25x-17 = 10x + 28

b)7x+40 = 11x +60 -2x

c) 5 (x-2) -7 (x+1) =9 • (3-2x)

d) 6 (x-3) -4 (x+2) =9x- (5x +3)



alguém me ajuda por favor

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Answer 1

Explicação passo-a-passo:

a)25x-17=10x+28

25x-10x=28+17

15x=45

x=45

__

15

x=3

b)7x+40=11x+60-2x

7x-11x+2x=60-40

-2x=20 .(-1)

2x=20

x=20

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2

x=10

c)

Answer 2

¡Hey!!

Explicação passo-a-passo:

$a) \: 25x - 17 = 10x + 28 \\ 25x - 10x = 28 + 17 \\ 15x = 45 \\ x = \frac{45}{15} \\ x = 3$

$b) \: 7x + 40 = 11x + 60 - 2x \\ 7x - 11x + 2x = 60 - 40 \\ - 4 x + 2x = 20 \\ - 2x = 20 \\ - x = \frac{20}{2} \: \: \: \: \: \: \: \: \: \: \: \: ( - 1) \\ x = - 10$

$5(x - 2) - 7(x + 1) = 9(3 - 2x) \\ 5x - 10 - 7x + 7 = 27 - 18x \\ 5x - 7x + 18x = 27 + 10 - 7 \\ - 2x + 18x = 37 - 7 \\ 16x = 30 \\ x = \frac{30}{16} \: \: \: \div 2 \\ x = \frac{15}{8}$

$d) \: 6(x - 3) - 4(x + 2) = 9x - (5x + 3) \\ 6x -18 - 4x - 8 = 9x - 5x + 3 \\ 6x - 4x - 9x + 5x = 3 + 18 + 8 \\ 2x - 9x + 5x = 29 \\ - 7x + 5x = 29 \\ - 2x = 29 \\ - x = \frac{29}{2} \: \: \: \: \: \: \: \: ( - 1) \\ x = - 14.5$

¡Bons estudos & Feliz Natal..