Question

1- Determine a raiz das seguintes funções do 1° grau:

a) Y= x - 4
b) Y= 3x - 6
c) Y= 2x - 4
d) Y= -2x + 8
e) Y= -5x - 6
f) Y= -10x + 20
g) Y= -4x - 10
h) Y= -5x - 7
i) Y= 2x - 2
j) Y= -9x + 18

Answer 1

A)X-4=0
X=4
B)3X-6=0
3X=6
X=6/3
X=2
C)2X-4=0
  2X=4
X=4/2
X=2
D)-2X=+8
-2X=-8
X=-8/-2
X=4
E)-5X-6=0
-5X=6(-1)
5X=-6
X=-6/5
F)-10X+20=0
-10X=-20
X=-20/-10
X=2
G)-4X-10=0
-4X=10
X=10/-4
X=-10/4(SIMPLIFICANDO POR 2)
X=-5/2
H)-5X-7=0
-5X=7(-1)
5X=-7
X=-7/5
I)2X-2=0
2X=2
X=2/2
X=1
J) -9X+18=0
-9X=-18
X=-18/-9
X=2

Answer 2

a) Y= x - 4x
x - 4 = 0
x= 4

b) Y= 3x - 6 
3x - 6 = 0
3x = 6
x = 6/3 = 2

c) Y= 2x - 4
2x - 4 = 0
2x = 4
x = 4 / 2 = 2

d) Y= -2x + 8
-2x + 8 = 0
-2 x = -8
x = -8/-2 = 4

e) Y= -5x - 6 
-5x - 6 = 0
-5x = 6
x = -(6/5)

f) Y= -10x + 20
-10x + 20 = 0
-10x = -20
x = -20 / 10 = -2

g) Y= -4x - 10
-4x - 10 = 0
-4x = 10
x = 10 / -4 = - (5/2)

h) Y= -5x - 7
-5x - 7 = 0
-5x = 7
x = - (7/5)

i) Y= 2x - 2 
2x-2 = 0
2x = 2
x = 1

j) Y= -9x + 18
-9x + 18 = 0
-9X = -18
X = -18 / -9 = 2