"the variable should be replace with a whole number"................pls answer this ASAP..........i really need it..........thanks!!!!!!!!!!!!!!
2006-06-26 00:04:43 · 7 answers · asked by armi_area 1 in Science & Mathematics ➔ Mathematics
using cross-multiplication, the value of
y=3
x=75
y=28
in that order.
2006-06-26 00:18:59 · answer #1 · answered by james 1 · 0⤊ 0⤋
You have the equation 18/30 = y/5. Look at the left side. You can reduce it to 3/5 = y/5 from which you an see that y = 5.
With the second equation, you can do the same thing. On the left side, multiply top and bottom by 5 so that you have65/75 = 65/x and so x must be 75.
2006-07-02 17:32:22 · answer #2 · answered by starman2718 3 · 0⤊ 0⤋
Easy:
18/30=y/5
then, 18*5=30*y
90=30y
y=90/30=3
All you have to do is multiply in a cross.
13/15=65/x
then you multiply the numerator from the first fraction by the denominator of the second and the denominator of the first by the numerator of the second.
you get:
15*65=13*x
975=13x
x=975/13
x=325
2006-06-26 07:14:27 · answer #3 · answered by Carla 4 · 0⤊ 0⤋
If a/b=c/d then a=b*c/d, b=a*d/c, c=a*d/b, d=c*b/a
18/30=y/5
y=5*18/30=3
13/15=65/x
x*13/15=65
x=65*15/13=75
12/y=3/7
12=y*3/7
12*7/3=y=28
2006-06-26 07:21:13 · answer #4 · answered by manda 4 · 0⤊ 0⤋
18/30=y/5
y=18/30 x5
= 90/30
=3
13/15 =65/x
x=65x15/13
=5x15
=75
12/y=3/7
12x7/3 =y
y=4x7=28
2006-06-26 07:32:34 · answer #5 · answered by flori 4 · 0⤊ 0⤋
1) y=5
2) x=75
3)y=28
2006-06-26 07:11:40 · answer #6 · answered by kokiwebs 2 · 0⤊ 0⤋
y=3
x=75
y=28
2006-06-26 10:38:09 · answer #7 · answered by Anonymous · 0⤊ 0⤋