Odpowiedź:
a)
3x - 8 = 2x + 4
3x - 2x = 4 + 8
x = 12
spr.
3x - 8 = 2x + 4
L= 3x - 8 = 3*12 - 8 = 36 - 8 = 28
P = 2x + 4= 2*12 + 4= 24 + 4= 28
28 = 28
L=P
b)
5x - 3 = 4x + 6
5x - 4x = 6 + 3
x= 9
spr.
5x - 3 = 4x + 6
L= 5x - 3= 5*9 - 3= 45 - 3= 42
P= 4x + 6 = 4*9 + 6 = 36 + 6 = 42
42 = 42
L=P
c)
7x - 9 = 6x - 8
7x - 6x = - 8 + 9
x= 1
spr.
7x - 9 = 6x - 8
L= 7x - 9 = 7 * 1 - 9= 7 - 9 = - 2
P= 6x - 8 = 6*1 - 8 = 6 - 8 = - 2
-2 = -2
L=P
d)
7x - 5 = 6x + 8
7x - 6x = 8 + 5
x= 13
spr.
7x - 5 = 6x + 8
L= 7x - 5 = 7*13 - 5= 91 - 5 = 86
P= 6x + 8 = 6*13 + 8 = 78 + 8 = 86
86 = 86
L=P
e)
5x - 8 = 4x + 9
5x - 4x = 9 + 8
x= 17
spr.
5x - 8 = 4x + 9
L= 5x - 8 = 5 * 17 - 8 = 85 - 8 = 77
P = 4x + 9 = 4*17+9= 68 + 9 = 77
77 = 77
L = P
f)
9x - 4 = 8x + 5
9x - 8x = 5 + 4
x = 9
spr.
9x - 4 = 8x + 5
L = 9x - 4 = 9 * 9 - 4 = 81 - 4 = 77
P = 8x + 5 = 8* 9 + 5 = 72 + 5 = 77
77 = 77
L = P
Szczegółowe wyjaśnienie:
