Question

Rozwiąż równania:
a) 5y=13
b) 1/7x=-2
c) -7b=7/8
d) 7x+7=35
e) 2-x=5-2x
f)69-x=x+96
g) 1/2x+5=x+8
h) 3-x=-2x

Answer 1

A)
5y = 13 |:5
y = 2,6

b)
1/7x = -2 |:1/7
x = -14

c)
-7b = 7/8 |:(-7)
b = -1/8

d)
7x+7 = 35
7x = 35-7
7x = 28 |:7
x = 4

e)
2-x = 5-2x
-x+2x = 5-2
x = 3

f)
69-x = x+96
-x-x = 96-69
-2x = 27 |:(-2)
x = -13,5

g)
1/2x+5 = x+8
0,5x-x = 8-5
-0,5x = 3 |:(-0,5)
x = -6

h)
3-x = -2x
-x+2x = -3
x = -3

Answer 2

5y=13 /5
y=2.6

1/7x=-2 *7
x=-14

-7b=7/8 /-7
b=7/8* -1/7
b=-1/8

7x+7=35 /7
x=35-7*1/7
x=4

2-x=5-2x
-x+2x=5-2
x=3

69-x=x+96
-2x=96-69
-2x=27 /-2
x=-13.5


1/2x+5=x+8 /*2
x+10=2x+16
x-2x=16-10
x=-6

3-x=-2x
-x+2x=-3
x=-3