this is a fraction problem with only letters
i've got to solve for a over c but i keep getting stuck can
you solve it for me???
a/b=c/d
now i can't get the a over the c without another letter next to it
=/
HELP!
2007-09-13 14:45:48 · 7 answers · asked by .anna. 2 in Education & Reference ➔ Homework Help
Cross multiply: ad = bc
Divide by d: (ad)/d = (bc)/d
a = (bc)/d
Divide by c: a/c = (bc)/(cd)
(a/c) = (b/d)
2007-09-13 14:52:25 · answer #1 · answered by gateach 5 · 0⤊ 0⤋
Because you always can switch the means (the two "middle" terms - the bottom of the first fraction and the top of the second fraction) without changing the value when you cross multiply, do that.
so, instead of a/b = c/d, you can write a/c = b/d. if you cross multiply to check, each time you will get: ad = bc, so that shows you that it does not matter which way you write it as long as you are switching only the "means."
2007-09-13 22:03:33 · answer #2 · answered by bostongal1989 2 · 0⤊ 0⤋
It could be a lot of things, but here is one: a\b=3\6 c\d=1\2 So c is 1.
2007-09-13 21:53:53 · answer #3 · answered by Persephone W 2 · 0⤊ 0⤋
multiply both side by 1/c to get a/bc = 1/d
Then multiply both side by b to get a/c = b/d.
so you're finish now.
2007-09-13 21:51:12 · answer #4 · answered by Polverizing K 2 · 0⤊ 0⤋
a/b=c/d
multiply both sides by "b"
(a/b)*b=(c/d)*b
since b/b=1,
a=cb/d
divide both sies by "c"
a/c=(cb/d)/c
since c/c=1,
a/c=b/d
QED.
2007-09-13 21:51:39 · answer #5 · answered by ? 3 · 0⤊ 0⤋
a/b = c/d
*d *d
a/bd = c
*bd *bd
a = cbd
/c /c
a/c=bd
2007-09-13 21:51:12 · answer #6 · answered by ♥thtsjstdcky♥ 3 · 0⤊ 0⤋
a/c = b/d
2007-09-13 21:50:26 · answer #7 · answered by Steve B 6 · 0⤊ 0⤋