Question

determine a raiz das seguintes funções a)y=4x-8
b) y=-7x+21
c) y=7x/3 -6
d)y=5x-2
e)y=x/4 - 1/2

Answer 1

a)y=4x-8 ==> 4x - 8 = 0 ==> 4x = 8 ==> x = 2

b) y=-7x+21 ==> -7x +21  = 0 ==> 7x = - 21 ==> x = - 3

c) y= 7x  - 6 ==> 7x - 6 = 0 ==> 7x - 18 ==> 7x = 18 ==> x = 18/7  
          3                 3

d)y= 5x-2 ==> 5x - 2 = 0 ==> 5x = 2 ==> x = 2/5

e)y=x/4 - 1/2 ==> x - 1 = 0 ==> x - 2 = 0 ==> x = 2
                             4  2