Rozwiąż równania spotnia pierwszego z jedna niewiadomą.
a) 5x - 2 =1
b) -x - 1 = - 2x - 2
c) 3(y + 1 ) = 2y
d)5 ( -2 + y ) = 7 (-y +1 )
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a)
5x - 2 =1
5x=1+2
5x=3/:5
x=3/5
b)
-x - 1 = - 2x - 2
-x+2x=-2+1
x=-1
c)
3(y + 1 ) = 2y
3y+3=2y
3y-2y=-3
y=-3
d)
5 ( -2 + y ) = 7 (-y +1 )
-10+5y=-7y+7
5y+7y=7+10
12y=17/:12
y=17/12
y=1 5/12
a) 5x-2=1
5x=1+2
5x=3 /:5
x=3/5
b) -x-1=-2x-2
-x+2x=-2+1
x=-1
c) 3(y+1)=2y
3y+3=2y
3y-2y=-3
y=-3
d)5(-2+ y)=7(-y+1)
-10+5y=-7y+7
5y+7y=7+10
12y=17 /:12
y=17/12= 1 i 5/12