I'm doing a physics E&M problem, but I'm stuck on a math part. I can't remember how to solve for x in this instance.
${x\over 2} = {0.04-x\over 5}$
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Here's a hint: If $\frac{a}{b} = \frac{c}{d}$, then $a\cdot d = b\cdot c$. – dannum Aug 22 '14 at 21:25
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HINT:
Multiply each side of the equation by $10$.
Add $2x$ to each side of the equation.
Divide each side of the equation by $7$.
barak manos
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Solve it like any other algebra problem like this. Isolate $x$ to one side and then make the necessary multiplications.
MT_
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$\frac{x}{2}=\frac{0.04-x}{5} \Rightarrow \frac{x}{2}+\frac{x}{5}=\frac{0.04}{5} \\ \Rightarrow \frac{7x}{10}=\frac{0.04}{5} \Rightarrow x=\frac{10}{7}\times \frac{0.04}{5}$
piRskwayrd
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1$\frac{x}{2}=\frac{0.04-x}{5} \Rightarrow \frac{x}{2}+\frac{x}{5}=0.04/5 $ – mike Aug 22 '14 at 23:33