Question

Rozwiąż metodą podstawiania :

{x+3y=3
x-y=5

Answer 1

{x+3y=3
x-y=5--------->x=5+y

5+y+3y=3
x=5+y

4y=-2
x=5+y

y=-1/2
x=5-1/2

y=-1/2
x=9/2

Answer 2

X+3y=3
x-y=5

x=3-3y
x-y=5

x=3-3y
3-3y-y=5

x=3-3y
3-4y=5

x=3-3y
-4y=5-3

x=3-3y
-4y=2

x=3-3y
y=-1/2

x=3+1,5
y=-1/2

x=4,5
y=-1/2