Question

1. Która z podanych liczb w nawiasie jest rozwiązaniem równania:
a) 4x+5=65 {12,5}
b) 4m+9=45 {4,2,9}
c) 58-5k=13 {3,4,9}
d) 8-64=0 {0,4,8}
e) 6r+4=7 {½, ⅓, ¼}
f) -15t-46=-1 {-3, -2, -1}

Answer 1

A) 4x+5=65 {12,5}

4x + 5 = 65
4x = 65-5
4x = 60 /: 4
x= 15

Odp. liczba: 15

b) 4m+9=45 {4,2,9}

4m + 9 = 45
4m = 45 - 9
4m = 36 /: 4
m = 9

Odp. liczba 9

c) 58-5k=13 {3,4,9}

58-5k=13
-5k = 13 - 58
-5k = -45 /: (-5)
k = 9

Odp. liczba 9

d) 8-64=0 {0,4,8}

8-64=0
8 = 64 /:8
0=8

Odp. liczba 8

e) 6r+4=7 {½, ⅓, ¼}

6r+4=7
6r = 7-4
6r = 3 /:6
r = ½

Odp. liczba ½

f) -15t-46=-1 {-3, -2, -1}

-15t - 46= -1
-15t = -1+46
-15t = 45 /: (-15)
t = -3

Odp. liczba -3

Answer 2

A) 4m + 5 = 65
4m = 65 - 5
4m = 60
m = 60/4
m = 12

b) 4m + 9 = 45
4m = 45 - 9
4m = 36
m = 36 / 4
m = 9

c) 58-5k = 13
- 5k = 13- 58
- 5k = -45
k = 9

d)



e) 6r +4=7
6r = 7-4
6r = 3
r = ½

f) -15t -46 = -1
-15t = -1+46
-15t = 45
t = -3

Answer 3

A) 4x+5=65)-5
4x=60/4
x=15
{12,5}-cos tu nie pasuje

b) 4m+9=45/-9 {4,2,9}
4m=36/4
m=9

c) 58-5k=13/-58 {3,4,9}
-5k=-45/(-5)
k=9

d) 8a-64=0/+64 {0,4,8}
8a=64/8
a=8

e) 6r+4=7/-4 {½, ⅓, ¼}
6r=3/6
r=3/6=1/2

f) -15t-46=-1/+46 {-3, -2, -1}
-15t=45/(-15)
t=-3