Odpowiedź:
Szczegółowe wyjaśnienie:
a)
3x - 8 = - 7 \ + 8
3x = 1 \ :3
x = 1/3
3 * 1/3 - 8 = 1 - 8 = -7
b)
4x - 2 = -2 \+2
4x = 0 \ :4
x = 0
4 * 0 - 2 = 0 - 2 = -2
c)
15x + 19 = 10 \-19
15x = -9 \:15
x = -9/15 = -3/5
15 *(-3/5) +19 = -9 + 19 = 10
d)
2x + 9 = 1 \ -9
2x = -8 \:2
x = -4
2 * (-4) + 9 = -8 + 9 = 1
e)
7x - 9 = 5 \ + 9
7x = 14 \:7
x = 2
7* 2 - 9 = 14 - 9 = 5
f) 8x + 5 = -7 \ -5
8x = -12 \:8
x = - 12/8 = -3/2 = -1,5
8 * (-1,5) + 5 = -12 + 5 = -7
g)
9x - 40 = 14 \ +40
9x = 54 \:9
x = 6
9 * 6 - 40 = 54 - 40 = 14
h)
20x + 7 = 31 \ - 7
20x = 24 \:20
x = 24/20 = 6/5 = 1,2
20 * 1,2 + 7 = 24 + 7 = 31
i)
6x - 25 = -25 \ +25
6x = 0 \:6
x = 0
6 * 0 - 25 = 0 - 25 = -25
