Question

5x+3y=13
-4x+9y=1 são
a)x=-2e y= -1
b)x=2e y=1
c)x=0e y=-1
d)x=2 e y =-3

Answer 1

Boa noite

 5x + 3y = 13,
-4x + 9y = 1 

15x + 9y = 39
-4x + 9y = 1
19x = 38
x = 2
10 + 3y = 13
3y = 3
y = 1

S = (2, 1)