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2010-04-08T20:13:00+02:00
A)1/x=5/15
5x = 15
x = 3

b)2/3=x/9
3x = 2 * 9
3x = 18
x = 6

c)2/x=7/21
7x = 2 * 21
7x = 42
x = 6

d)x+1/x=6/4
(x + 1)* 4 = 6x
4x + 4 = 6x
2x = 4
x = 1/2
2010-04-08T20:13:05+02:00
A) 1/x=5/15
5*x=1*15
5x=15/5
x=3

b)2/3=x/9
3x=9*2
3x=18/3
x=6

c)2/x=7/21
7x=21*2
7x=42//7
x=6

d)
x+1/x=6/4
6x=4(x+1)
6x=4x+4
6x-4x=4
2x=4/2
x=2