SOLUTION: 4x+9=7 i know the answer is negative 1/2 but i just dont know how my teacher got that, and also z/80= 20/100

Algebra ->  Linear-equations -> SOLUTION: 4x+9=7 i know the answer is negative 1/2 but i just dont know how my teacher got that, and also z/80= 20/100      Log On


   

Question 6695: 4x+9=7 i know the answer is negative 1/2 but i just dont know how my teacher got that, and also z/80= 20/100
Answer by xcentaur(357) About Me  (Show Source):
You can put this solution on YOUR website!
4x+9=7
4x=7-9
4x=-2
x=-2/4
x=-1/2


z/80= 20/100
z=(20/100)*80
z=(1/5)*80
z=16


Prabhat.