What is the proper way to work this probelm...4cd =14...c=1/2d=7
What is the right way to wok this problem ?
Hi Leona,
I'm not sure that you have stated your question properly. Try and be a little clearer. Use parentheses, separate lines, anything to set apart what it is you are trying to convey.
Looks like your original equation is $\displaystyle 4cd=14$
Then, the second part is ambiguous.
Dose $\displaystyle c=\frac{1}{2}d$ and does $\displaystyle \frac{1}{2}d=7$?
If that's the case, then substitute 7 for c and solve for d. But I'm not sure that's the case.
Ok, Leona, I think you intend to state the problem this way.
$\displaystyle 4cd=14$
$\displaystyle c=\frac{1}{2}$
Substituting, we get
$\displaystyle 4\left(\frac{1}{2}\right)d=14$
$\displaystyle 2d=14$
$\displaystyle \frac{2d}{2}=\frac{14}{2}$
$\displaystyle d=7$
Checking, we substitute the values we found for c and d back into the original equation and get:
$\displaystyle 4\left(\frac{1}{2}\right)(7)=14$
$\displaystyle 4(3.5)=14$
$\displaystyle 14=14$