Respostas

2013-10-03T12:15:36-03:00
A) 7x-10=2x+10 = 7x-2x=20  5x=20  x=4
b) 8y-3y-50=10 = 5y =60 y=12

c)9x-40=-x+140  10x = 180 x=18

d) 24+x+3x=20  4x=4 x=1

e) 2y+y=2y-40  y= - 40