I was checking out this problem on Yahoo! Education that I can't seem to figure out. The link for it is:
http://education.yahoo.com/homework_help/math_help/problem?id=minialg1gt_3_1_1_4_20
The problem with that question for me is why do you use the reciprocal property in this case, and not others, and also, what happens to the number 4 that was in the original question?
2007-04-02 16:00:24 · 3 answers · asked by Funny Joey 1 in Science & Mathematics ➔ Mathematics
Be sure to look at the "step" thing
2007-04-02 16:03:23 · update #1
Hi,
Solve.
4.......7
--..=..--- The reciprocal property is an extra unneeded step.
2y.....5
If it had just taught them to cross-multiply to solve the equation it would have been much easier and straight forward.
The "4" in the problem reduced from 2y/4 to y/2 in their method.
I hope that helps!! :-)
2007-04-02 16:08:28 · answer #1 · answered by Pi R Squared 7 · 0⤊ 0⤋
There's more than one way to skin cats, and to solve equations too. The simplest way is to cross multiply to get 14y= 20, and y= 1+3/7 . Using reciprocals leads to the same result.
2007-04-02 23:06:29 · answer #2 · answered by cattbarf 7 · 0⤊ 0⤋
Crossing:
2y * 7 = 4 * 5
14y = 20
y = 20/14
y = 10/7
:.:
2007-04-02 23:06:24 · answer #3 · answered by aeiou 7 · 0⤊ 0⤋