• Matéria: Matemática
  • Autor: juliamartins321
  • Perguntado 9 anos atrás

Quanto é
a) 5x-7-2x-2=0
b) 5x+4-2x=26-3x
c) y+9+5y=-3+2y+7
d) 3x-4=5x+12

Respostas

respondido por: LuanaSC8
0
a) 5x-7-2x-2=0\to~ 3x-9=0\to~ 3x=9\to~ x= \frac{9}{3} \to ~\boxed{x=3}\\\\\\\\ b) 5x+4-2x=26-3x\to ~ 5x-2x+3x=26-4\to~ 6x=22\to~ \\\\ x= \frac{22}{6} \to~ \boxed{x= \frac{11}{3} }



c) y+9+5y=-3+2y+7\to~ y+5y-2y=-3+7-9\to~ \\\\ 4y=-5\to~ \boxed{y=- \frac{5}{4} }\\\\\\\\ d) 3x-4=5x+12\to~ 3x-5x=12+4\to~ -2x=16~(-1)\to~ \\\\ 2x=-16\to~ x=- \frac{16}{2} \to~ \boxed{x=-8}
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