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y= 25
b. x=40
y= 80
c. y= 3
x= 6
x-5
y-7
b.
x-40
y-80
c.
x-6
y-3
y=x+2
x=5
y=5+2
x=5
y=7
b)x+10=50
y=2x
x=50-10
y=2x
x=40
y=2*40
x=40
y=80
c)x=9-y
y-3=0
x=9-y
y=3
x=9-3
y=3
x=6
y=3
Pozdrawiam :PP