Question

Resolva a função de 1° grau.

A) f (x) = -3 - 1
B) f (x) 5x + 15
C) f (x) -x - 1
D) f (x) 3x + 6

Answer 1

A)
f (x) = - 3x - 1
0 = - 3x - 1
3x = - 1
x = - 1/3

¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
B)
f (x) = 5x + 15
0 = 5x + 15
- 15 = 5x
5x =- 15
x = - 15/5
x = - 3
¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
C)
f (x) = - x - 1 
0 = - x - 1
x = - 1


¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨¨
D)
f (x) = 3x + 6
0 = 3x + 6
- 6 = 3x
3x = - 6
x = - 6/3
x = - 2