Question

x+y=75 / x-8=y+7 como resolve essa conta ?

Answer 1

I- x + y = 75

II- x - 8 = y + 7

I- x + y = 75

  x = 75 - y

II- x - 8 = y + 7

  75 - y - 8 = y + 7

  -y -  y = 7 - 75

  -2y = -68 (-1)

   2y = 68

    y = 68/2

    y = 34

I- x = 75 - y

  x = 75 - 34

  x = 41

Answer 2

x+y=75 (x=75-y)

x-8=y+7

75-y-8=y+7 x=75-38
-y-y=-75+7-8 x=37
-2y=-83+7
-2y=-76
y=-76/2(-1)
y=38