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  • Usuário do Brainly
2014-08-19T19:43:39-03:00
A)
y=-4x+1
-4x+1=0
-4x=-1
4x=1

x= \frac{1}{4}

S={ \frac{1}{4} }

b)
y=3x-7
3x-7=0
3x=7
x= \frac{7}{3}

S={ \frac{7}{3} }

c)
y= \frac{3x}{4} +6

 \frac{3x}{4} +6=0

 \frac{3x+24}{4} =0

3x=-24

x=- \frac{24}{3}

x=-8

S={-8}

d)
y= \frac{x}{3}

 \frac{x}{3} =0

x=0

S={0}
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