Resposta :
4) y + 15 + 2y = 45
3y = 30
y = 10
x = 10 + 15
x = 25
S = ( 25 ; 10)
5) x = 24 + 3y
4 ( 24 + 3y ) + 3y = 6
96 + 12y + 3y = 6
15y = -90
y = - 18
x = 24 + 3 ( - 18 )
x = 24 - ( - 54 )
x = 24 + 54
x = 78
S = ( 78 ; -18 )
4) y + 15 + 2y = 45
3y = 30
y = 10
x = 10 + 15
x = 25
S = ( 25 ; 10)
5) x = 24 + 3y
4 ( 24 + 3y ) + 3y = 6
96 + 12y + 3y = 6
15y = -90
y = - 18
x = 24 + 3 ( - 18 )
x = 24 - ( - 54 )
x = 24 + 54
x = 78
S = ( 78 ; -18 )