Question

Determine a raiz das seguintes funções do 1° grau

a) Y= 4x-8

b) Y= -7x+21

c) Y= 7/3 x-6

d) Y= -x

Answer 1

a) Y= 4x -8y-4x=-8Yx=-8/-4=2 

b)Y= -7x+21
7x=21
x=21/7
xY=3

c) Y= 7/3 x-6 
y-7/3x=-6
yX=-6/1÷7/3
yX=1/4

d) Y= -x