Question

me ajudem por favor vou da bastante ponto preciso entregar hoje ainda!!!!! são essas duas por favor !!!​

Answer 1

1) a) 2x = 34

x= 34/2

x= 17

15 = -3y

15/-3= y

y= - 5

b) x+5=15

x= 15-5

x= 10

3y = -21

y= -21/3

y= -7

c) 5x +3= 3x

5x -3x = -3

2x = -3

x= -3/2

4y = -20

y= -20/4

y= -5

d) 12 - 3x = 2x+1

12 - 1 = 2x +3x

11= 5x

x = 11/5

120= 20y

120/20= y

y= 6

e) x² = -5x -4

x²+5x +4=0

∆=5² -4.1.4

∆= 25 -16

∆= 9

x= -5 ±√9/2.1

x= - 5 ±3/2

x1= -5+3/2= -2/2= -1

x2= -5-3/2= -8/2= -4

30 -2y = 26

- 2y = 26 -30

- 2y = -4

y= -4/-2

y= +2

f) 30-2x = x+3

-2x - x = 3 - 30

- 3x = - 27

x= -27/-3

x= +9

28 = 4y

28/4= y

y= 7

g) 6x - 8= 3x +7

6x - 3x = 7 +8

3x = 15

x= 15/3

x= 5

23= 8+3y

23 - 8 = 3y

15 = 3y

15/3= y

y= 5

h) x² +3x = -2

x²+3x +2=0

∆= 3² -4.1.2

∆= 9 -8

∆= 1

x= -3 ±√1/2.1

x= -3 ±1/2

x1= -3+1/2= -2/2= -1

x2= -3-1/2= -4/2= -2

4y = 10-y

4y + y = 10

5y = 10

y= 10/5

y= 2

i) 100 -3x = 2x

-3x -2x = -100

-5x = - 100

x= -100/-5

x= + 20

28y = 21y -35

28y - 21y = -35

7y = -35

y= -35/7

y= - 5

2) A= (-2, 4)

B= ( 3, 4)

C= ( 2,0)

D= (-2, -3)

E= ( 1 , -3)