Question

a) X = 10 y
X + y = 24
b) X-y = 20
4x + y = 20
c) X + y = 3
24 - 18 = -40
d) 4x + y = 14
10x - 4 y = -10 Ajuda por favor ​

Answer 1

Resposta:

Olá boa tarde

a)

x = 10 y

x + y = 24

10y + y = 24

11y = 24

y = 24/11

x = 10(11/24)

x = 110/24

x = 55/12

b)

x-y = 20

4x + y = 20

x = 20 + y

4(20+y) + y = 20

80+4y+y = 20

5y = 20-80

5y = -60

y= -60/5

y = -12

x= 20+(-12)

x = 8

c) ?

x + y = 3

24x - 18y = -40

x = 3 - y

24(3-y) - 18y = -40

72 -24y -18y = -40

-42y = -112

y = 112/42

y = 56/21

x = 3 -56/21

x = -35/21

d)

4x + y = 14

10x - 4 y = -10

y = 14 - 4x

10x - 4(14-4x) = -10

10x - 56 + 16x = -10

36x = 56 - 10

36x = 46

x = 46/36

x = 23/12

y = 14 - 4(23/12)

y = 14 - 23/3

y = 49/3