Question

resolva o problema x+y=9. 4x-10y=8

Answer 1

x + y = 9 * (10)

4x - 10y = 8
____________


10x + 10y = 90

4x - 10y = 8

14x = 98

X = 98 / 14

X = 7



y = 9 - x

y = 9 - 7

y = 2



S = { 7 , 2 }