Question

Resolva as seguintes equações do 1° grau: ​
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Answer 1

1) $4x = 20$

$x = \frac{20}{4}$

$x = 5.$

2) $7x = -14$

$x = \frac{-14}{7}$

$x = -2.$

3) $6x = 10$

$x = \frac{10}{6}$

$x = \frac{5}{3} \: \: ou \: \: x \approx 1,6.$

4) $15 x = - 9$

$x = \frac{-9}{15}$

$x = \frac{-3}{5} \: \: ou \: \: x = 0,6.$

5) $-3x = 9$

$x = \frac{9}{-3}$

$x = -3.$

6) $-7x = -14$

$x = \frac{-14}{-7}$

$x = 2.$

7) $-6x = 14$

$x = \frac{14}{-6}$

$x = \frac{-7}{3} \:\: ou \:\: x \approx -2,3.$

8) $-5x = -15$

$x = \frac{-15}{-5}$

$x = 3.$

9) $3x - 1 = 8$

$3x = 8 + 1$

$x = \frac{9}{3}$

$x = 3.$

10) $-x + 2 = 5$

$-x = 5 - 2$

$- x = 3$

$x = -3.$

11) $-2x + 4 = -5$

$-2x = -5 -4$

$-2x = -9$

$x = \frac{-9}{-2} \:\: ou \:\; x = 4,5.$

12) $6x -1 = 9$

$6x = 9 + 1$

$x = \frac{10}{6}$

$x = \frac{5}{3} \:\: ou \:\: x \approx 1,6.$

13) $5x + 7 = 2x + 13$

$5x = 2x +13 - 7$

$5x - 2x = 13 - 7$

$3x = 6$

$x = \frac{6}{3}$

$x = 2.$

14) $4x - 5 = 5x -1$

$4x = 5x - 1 + 5$

$4x - 5x = -1 + 5$

$-x = 4$

$x = -4.$

15) $2x + 3 = 9 - x$

$2x = 9 - x - 3$

$2x + x = 9 -3$

$3x = 6$

$x = \frac{6}{3}$

$x = 2.$

16) $4x + 11 = 7x + 1$

$4x = 7x + 1 - 11$

$4x -7x = 1 - 11$

$-3x = -10$

$x = \frac{-10}{-3} \:\: ou \:\: x \approx 3,3.$