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5x-y=4
5y-y=4
x=y
4y=4 /:4
x=y
y=1
x=1
b) y=2x+1
4x+y=13
4x+2x+1=13
y=2x+1
4x+2x=13-1
y=2x+1
6x=12 /6
y=2x+1
x=2
y=2*2+1
x=2
y=5
c) 5y - x = 3
x = 3 - y
5y-(-3-y)=3
x=3-y
5y-3+y=3
x=3-y
5y+y=3+3
x=3-y
6y=6 /:6
x=3-y
y=1
x=2
Proszę bardzo :*