Question

Resolva as equações
a) 16+8y=3
b) 5x=12x+49
c) 20-8x=-19-21x
d) 9x-31=34x=13
e)15-9x=5x+64
f) -18+2x+6=7x-12-8x

Answer 1

a) 16+8y=3; 8y=3-16; y=-13/8
b) 5x=12x+49; 5x-12x=49; -7x=49; x=49/-7; x=-7
c) 20-8x=19-21x; -8x+21x=19-20; 13x=1; x=1/13
e) 15-9x=5x+64; -9x-5x=64-15; -14x=49; x=49/14;
f) -18+2x+6=7x-12-8x; 2x-7x+8x=-12+18-6; 3x=0; x=3

Answer 2

a)16+8y=3
    8y=3-16
    8y=-13
    y=-13/8

b)5x=12x+49
   5x-12x=49
  -7x=49
   x=49/-7
   x=-7

c)20-8x=-19-21x
   -8x+21x=-19-20
   13x=-39
   x=-39/13
   x=-13

d)9x-31=34x+13
  9x-34x=13+31
  -25x=44
   x=44/-25
   x=-44/25

e)15-9x=5x+64
   -9x-5x=64-15
   -14x=49
   x=49/-14
   x=-49/14

f)-18+2x+6=7x-12-8x
   2x-7x+8x=-12+18-6
   3x=0
   x=0/3
   x=0