5. Rozwiąż równania a. 2x + 8 = 5x-1 b. 3 (x-4)+2=8-x c.9y-2(4-y)=y+12
a.
2x + 8 = 5x-1
2x-5x=-1-8
-3x=-9 /:(-3)
x=3
b.
3 (x-4)+2=8-x
3x-12+2=8-x
3x+x=8-2+12
4x=18 /:4
x=18/4
x= 4 i 1/2
c.
9y-2(4-y)=y+12
9y-8+2y=y+12
9y+2y-y=12+8
10y=20 /:10
y=2
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a.
2x + 8 = 5x-1
2x-5x=-1-8
-3x=-9 /:(-3)
x=3
b.
3 (x-4)+2=8-x
3x-12+2=8-x
3x+x=8-2+12
4x=18 /:4
x=18/4
x= 4 i 1/2
c.
9y-2(4-y)=y+12
9y-8+2y=y+12
9y+2y-y=12+8
10y=20 /:10
y=2