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a) x=y
5x-y=4
x=y
5x - x=4
x=y
4x=4
x=y
x=1
Odp. x=1
y=1
x=y
5x-y=4
x=y
5*y-y=4
x=y
5y-y=4
x=y
4y=4 /:4
x=y
y=1
x=1
y=1
c)
5y-x=3
x=3-y
x=3-y
5y-3-y=3
x=3-y
5y-y=3+3
x=3-y
4y=6 /;4
x=3-y
y=1,5
x=3-1,5
y=1,5
x=1,5
y=1,5