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Solve for X and Y: 2y + x = 7; 3y - x = 8

x=1, y=3; Firstly, rearranging for x in the first equation: x = (7-2y); Substitute this into the second equation: 3y - (7 -2y) = 8; Expand: 3y -7 +2y = 8 (watch negative) 3y +2y = 15 Therefore, 5y = 15 and y...
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Answered by Ruth K. • Maths tutor
5784 Views

Sodium and sodium iodide can both conduct electricity when molten, but only sodium can conduct electricity when solid. Explain this difference in conductivity in terms of the structures of sodium and sodium iodide.

When approaching a question like this, it’s important to identify the two compounds that we are dealing with first. Sodium is an alkali metal, and therefore the metallic structure that it forms comes from me...
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Answered by Karol B. • Chemistry tutor
61896 Views

Outline the Euthyphro's dilemma

In the Platonic dialogue Euthyphro, Socrates asks the greek prophet Euthyphro the question: "is the pious pious because it is loved by the gods or is it loved by the gods because it is pious?", tha...
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Answered by Silvia V. • Philosophy tutor
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A right-angled triangle has side lengths of 8.65cm and 10.15cm. What is the length of its hypotenuse?

Step 1: Draw a labelled diagram of the triangle, marking the side lengths. Step 2: Recall Pythagoras’ theorem equation ‘c2=a2+b2’ Step 3: Substitute the values of a and b into the equation. c2=8.652+10.152 S...
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Answered by Alisha M. • Maths tutor
3942 Views

What is the best way to revise for my Maths GCSE?

I believe that there is no better way to revise for Maths than to continually practice questions (especially those that you find most tricky!) The more you practise, the easier you'll find the questions beca...
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Answered by Alisha M. • Maths tutor
4269 Views