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I need help with problem 11, please! ​

I need help with problem 11, please! ​-example-1
User Crolle
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Explanation:

solving for x means that we end up with something like

x = ...

or

... = x

remember, whatever e do, we must do on both sides of the equation.

z = 4(n + p)/(5x)

what disturbs us most is that there is a division (or fraction) AND that x is in the denominator (bottom).

so, let's multiply both sides by 5x :

5x×z = 5x×4(n + p)/5x = 4(n + p)

now, what is blocking us from our target form is that x has a factor of 5z.

so, let's divide both sides by 5z :

5xz / 5z = 4(n + p) / 5z

x = 4(n + p)/(5z)

done.

User Lihongxu
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