Question

{×+4y = -3
{-3×-y = -24

Answer 1

x = -3 -4y

-3(-3-4y) -y = -24
9 + 12y -y +24 = 0
11y + 33 = 0
y = -33/11 = -3

x = -3 -4(-3)
x = 9

Answer 2

×+4y = -3 -----> x= -3 - 4y

-3×-y = -24
-3( -3 - 4y) -y = -24
9 + 12y -y = -24
11y = -33
y= -3

x= -3 - 4y
x= -3 +12
x= 9

S={9; - 3}