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Solve the simultaneous equations 5x + 3y = 24 and 3x - 4y = 26

Ok, so here are the equations5x+3y=243x-4y=26So let's multiply the first equation by 3, which gives us:15x+9y=72Now let's multiply the second equation by 5, which gives us:15x-20y=130So we're now left with:1...
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Answered by William S. • Maths tutor
12280 Views

Why does the solubility of Group 2 hydroxides in water increase down the group?

Firstly, we must consider the thermodynamics involved It is known that a reaction is spontaneous due to thermodynamic favourability if the Gibbs Free Energy is negative. This is further broken down to entrop...
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Answered by Eleni N. • Chemistry tutor
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How do I solve x^2+6x+8=0?

Ok, so we would call this a quadratic equation because it is written in the form of ax^2+bx+c=0 (in our case, a=1, b=6, c=8).Luckily, this type of quadratic equation can be factorised, so we can solve it eas...
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Answered by William S. • Maths tutor
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What is Price Elasticity of Demand?

Price Elasticity of Demand refers to an economic measure which evaluates the change in price of a good against its respective change in demand. In simple terms: If the price of a good rises by a certain amou...
KC
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Describe two different test tube reactions to identify the following organic compounds: propanal and benzoic acid.

There are several different answers one could make and an exam question would just require one for each. 1) Propanal - from the ending "al" this is an aldehyde. - Add Tollens' reagent. Positive res...
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Answered by Daniel D. • Chemistry tutor
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