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4*x+1=25
4x=25-1
4x=24 /:4
x=6
spr.
4*6+1=25
24+1=25
25=25
L=P
b)
9+3*x=15
3x=15-9
3x=6 /:3
x=2
spr.
9+3*2=15
9+6=15
15=15
L=P
c)
16+2*x=17
2x=17-16
2x=1 /:2
x=1/2
spr.
16+2*1/2=17
16+1=17
17=17
L=P
d)
5*x-6=9
5x=9+6
5x=15 /:5
x=3
spr.
5*3-6=9
15-6=9
9=9
L=P
4*x + 1 = 25
4x= 25 - 1
4x= 24
x= 24 : 4
x= 6
spr.
4x + 1= 25
L = 4x + 1= 4*6 + 1= 24 + 1= 25
P= 25
25=25
L=P
b)
9 + 3x = 15
3x = 15 - 9
3x= 6
x= 6 : 3
x= 2
spr.
9 + 3x = 15
L= 9 + 3x= 9 + 3*2= 9 + 6 = 15
P = 15
15=15
L=P
c)
16 + 2x= 17
2x = 17 - 16
2x= 1
x= 1 : 2
x= 0,5
spr.
16 + 2x= 17
L = 16 + 2x= 16 + 2 * 0,5 = 16 + 1= 17
P=17
17=17
L=P
d)
5x - 6 = 9
5x = 9 + 6
5x= 15
x= 15 : 5
x= 3
spr.
5x - 6 = 9
L= 5x - 6 = 5 *3 - 6 = 15 - 6 = 9
P= 9
9=9
L=P