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Solve the simaltaneous equations: 3x + 4y = 10, 2x + 3y = 7

Solving by elimination 1. multiply the equations by a number so that the number in front of either x or y is the same for both equations: 3x + 4y = 10 (X2) --> 6x + 8y = 20 2x + 3y = 7 (X3) --> 6x + 9y...
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Answered by Sarah T. • Maths tutor
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How can I work out whether a hydrocarbon is an alkene or an alkane from its molecular formula?

Step 1: Look at the molecular formula of the hydrocarbon you have been given. (This is the formula that tells you exactly how many hydrogens and how many carbons are present.) Step 2: * Refer back to the gen...
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Answered by Alice H. • Chemistry tutor
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‘What do the buildings in the Roman forum tell us about how the forum was used during the Republic?’

The Roman forum was both a political and religious centre. Various temples and shrines improved the appearance of the forum and served the dual purpose of being used for both religious and political purposes...
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Solve 3(2x + 5) = 4 – x

The first thing to do in this problem is to expand the brackets. This means we times whatever is in the bracket by the number on the outside, in this instance the number is 3. We do not worry about the right...
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Answered by Brandon R. • Maths tutor
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Show that 3/8 divided by 7/12 = 9/14

When dividing by a fraction, it is actually a multiplication. All you need to do is flip the second fraction over. This is known as the reciprocal. In this example the fraction we want to flip is 7/12. Flipp...
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Answered by Brandon R. • Maths tutor
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