Question

Determine a raiz das funções do 1º grau:
a) y = 3x - 21
b) y = -5x + 25
c) y = 7x - 42
d) y = 3x + 24
e) y = 2x - 5

Answer 1

Boa tarde Marcio

a) y = 3x - 21 = 0 ,  3x = 21 = x = 21/3 = 7

b) y = -5x + 25 = 0 ,  5x = 25,  x = 25/5 = 5

c) y = 7x - 42 = 0,  7x = 42,  x = 42/7 = 6

d) y = 3x + 24 = 0,  3x = -24,  x = -24/3 = -8

e) y = 2x - 5 = 0 , 2x = 5,  x = 5/2