Question

Sabendo-se que x + y = -5, o valor de 100x + 100y é igual a -50...

Qual o cálculo disso?

Answer 1

       x+y=-5
      100x+100y=-50

x=y-5
100(y-5)+100y=-50
100y-500+100y=-50
200y=450
y=450/200
y=9/4

x=9/4-5
x=-11/4

Answer 2

x+y=-5
100x+100y=-50
x=y-5
100(y-5)+100y=-50
100y-500+100y=-50
200y=450
y=450/200
y=9/4
x=9/4-5
x=-11/4