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
a) y = 3x - 21
b) y = -5x + 25
c) y = 7x - 42
d) y = 3x + 24
e) y = 2x - 5
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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