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y+4x=13
2y-4x=2
y+4x=13
3y=15
y=5
5 -2x=1
y=5
-2x=-4
y=5
x=2
2.
5y-x=3
y+x=3
6y=6
y=1
5- x=3
x=2
4x+y=13
y-2x=1/×2
y+4x=13
2y-4x=2
y+4x=13
-----------------
3y=15/:3
y=5
2x=y-1
2x=5-1
2x=4/:2
x=2
y=5
C) 5y-x=3
x=3-y
5y-x=3
y+x=3
---------------
6y=6/:6
y=1
x=3-y
x=3-1
x=2
y=1
4x+y=13
y=2x+1
4x+2x+1=13
y=2x+1
4x+2x+1=13
y=2x+1
6x+1=13
y=2x+1
6x=13-1
y=2x+1
6x=12/:6
y=2x+1
x=2
y=2*2+1
x=2
y=4+1
x=2
y=5
x=2
c) 5y-x=3
x=3-y
5y-3-y=3
x=3-y
6y-3=3
x=3-y
6y=3+3
x=3-y
6y=6/:6
x=3-y
y=1
x=3-1
y=1
x=2
to jest dobrze na pewno ,bo miałam na zeszłej lekcji to zadanie xD