8. kafli

$28$

$x-5$

$1$

$-\frac{8}{3}$

$-25$

$4y$

$4$

$-21$

$3$

$12$

$478$

x = −16

x = −20

n = −1

x = −4

$p=\frac{7}{6}$

$q=\frac{2}{3}$

b = 6.4

c = 14

y = 15

z = 2

p = 5

q = −16

h = −1

x = 1

x + 11 = 41; x = 30

y − 12 = 51; y = 63

4x − 3x = 14; x = 14

7a − 6a = −8; a = −8

a + 6 = 13; Athena vegur 7 pund.

26 + h = 68; Henry á 42 bækur.

19.875 = s − 1.025; uppgefið verð er 20.900 dalir.

7,75 = n − 3,25; verðið á kvöldin er 11,00 dalir.

y = −16

z = −13

b = 144

c = 128

k = −8

g = −3

n = 35

y = 18

x = 2

n = −5

c = −3

$x=-\frac{4}{7}$

n = −6

n = −5

x = −4

a = −8

y = 5

m = 9

n = 10

c = 1

p = −7

m = −3

j = 2

h = 1

x = −1

y = 4

q = 1

n = 1

a = −5

k = −6

x = 10

y = −3

x = −5

y = −5

x = 4

y = 1

y = −6

z = 8

a = 2

n = 2

$j=\frac{5}{3}$

$k=\frac{5}{2}$

p = −2

q = −8

u = 2

x = 4

n = 1

m = −1

$x=\frac{1}{2}$

y = 3

v = 40

u = −12

a = −2

c = −2

p = −4

q = 2

n = 2

m = −1

x = 20

x = 10

h = 12

k = −1

n = 9

d = 16

x = 5

$b=\frac{1}{2}$

p = −11.7

a = 10

$x=\frac{7}{3}$

y = 13.8

x = −27

$q=-\frac{1}{4}$

$y=\frac{27}{20}$

m = 17

x = 8

n = −20

y = 2

w = −1.7

x = −2

m = −4

k = 6

c = −41

y = 28

x + (−5) = 33; x = 38

y − 3 = −19; y = −16

p + 8 = 52; p = 44

5c − 4c = 60; c = 60

$f-\frac{1}{3}=\frac{1}{12};f=\frac{5}{12}$

−9m + 10m = −25; m = −25

Látum p tákna blaðsíðufjöldann sem Jeff las í sálfræðibókinni. 41 + p = 54. Jeff las 13 blaðsíður í sálfræðibókinni.

Látum d tákna aldur dótturinnar. d = 12 − 5. Dóttir Evu er 7 ára.

$d=\frac{13}{24}$

p = 9

x = 3

y = −6

m = 7

a = 15

x = 0

z = 28

c = 36

q = −48

p = 80

r = 25

x = −32

$q=\frac{5}{2}$

y = −1

m = −5

$t=\frac{5}{2}$

q = 24

p = 56

x = 6

y = 6

m = −8

b = −8

x = −4

q = −2

k = −11

x = 9

b = −3

z = 3

$x=-\frac{3}{4}$

r = −2

x = 19

f = 7

q = −5

c = −4

x = 2

y = 4

m = −6

a = 7

a = −40

p = 15

z = 3.46

w = 60

x = 23

y = 9

x = 6

y = 3

n = −2

p = −1

x = 5

v = 1

m = 0.25

t = −9

b = 2

m = 6

$k=\frac{3}{2}$

r = 3

y = −4

n = 2

x = 34

s = 10

$x=\frac{1}{2}$

x = −1

y = −1

$a=\frac{3}{4}$

x = 4

m = 20

x = −3

$w=\frac{9}{4}$

x = 1

b = 12

x = 1

p = −41

$x=-\frac{5}{2}$

y = 10

j = 2

x = 18

x = 18

x = 20

n = 9

d = 8

q = 11

d = 18

$a=\frac{4}{3}$

u = 17

$c=\frac{12}{11}$

n = 44

$f=\frac{10}{3}$

y = 4

n = −8

−6 + m = 25; m = 31

s = 11 − 3; 8 ára

c − 46.25 = 9.75; $56.00

x = 9

p = 21

n = 108

x = 48

m = 4

x = 15

r = 3

p = 5

x = −22

y = −13

k = −5

x = 6

u = −7

x = −2

s = −22

y = 12

r = 38

y = 26

n = 2

$a=\frac{14}{3}$

x = 5

p = −20

c = 16

x = −5

x = 9

y = 4

m = 6

d = −32

x = −2

$p=\frac{2}{3}$

2x − 4 = 16; x = 10