Question

24. Resolva os sistemas a) x+y=-3 3x+y=1

Answer 1

x = - 3 - y   x = - 3 - (-5)

x = 2

3(-3 -y) + y = 1

-9 -3y + y = 1

-3y + y = 1 + 9

-2y = 10

y = 10/-2

y = -5

Answer 2

x+y = -3
3x+y = 1

x + y = -3 *(-1)
-x -y = 3

-x - y = 3
3x + y = 1
2x = 4
x = 4/2
x = 2.

3x + y = 1
3*2 + y = 1
6 + y = 1
y = 1-6
y = -5.

S = {2,-5}. Espero ter ajudado!❤