Question

Rozwiąż równania:
a) 1/2x + 1 = 5
b) 1/3y - 2 = 4
c) -2k + 6 = 18
d) -5z - 3 = 22
e) 9z - 8 + = 5z
f) s + 4 = -3s

Answer 1

A)
 1/2x +1 = 5   | obustronnie odejmujemy 1
1/2x = 4      | mnożymy *2
x=8

b)
1/3y -2 = 4  | +2
1/3y = 6  | *3
y=18

c)
-2k+6 = 18  | -6
-2k = 12 | :(-2)
k = -6

d)
-5z - 3 = 22    | +3
-5z = 25   | : (-5)
z= -5

e)
9z - 8 = 5z   | -5z
9z - 5z -8 = 0  |+8
4z=8  | :4
z=2

f)
s+4 = -3s    | -s
4= -4s   | : (-4)
s= -1