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The equation of the line L1 is y = 3x – 2. The equation of the line L2 is 3y – 9x + 5 = 0. Show that these two lines are parallel.

The equation of a straight line is usually given in the form y = mx + c. To prove that two lines are parallel we will need to show that both lines have the same gradient. The gradient of a line is the slope/...
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Answered by Tanya K. • Maths tutor
4870 Views

The focal length of the lens is 10 cm. Calculate the power of the lens. State the unit.

first, convert to metres:10cm = 0.1mlens power = 1/focal lengthpower = 1/0.1 =10units are Dioptres, Dso the power of the lens is 10 D
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Answered by Aleks H. • Physics tutor
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The rate of the reaction between magnesium ribbon and hydrochloric acid can be increased by increasing the concentration of the acid. State two other ways of increasing the rate of this reaction

Increase the surface area of the magnesium, for example by using a powder.Increase the temperature of the reaction.Add a catalyst
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Answered by Aleks H. • Chemistry tutor
5167 Views

Why do men and women speak differently?

Do men and women really speak differently? If so, why? Let's take a look! Men are from Mars and women are from Venus? Gender difference theory explained: Gender difference theory is modelled on the idea that...
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Answered by Polly C. • English tutor
9749 Views

The United Kingdom uses First Past The Post ('FPTP') voting. Highlight some advantages and disadvantages of this system.

First Past The Post is considered a 'pluralist' voting system, in that all eligible voters have a single vote to cast, and the recipient of the highest number of votes (a 'plurality') wins outright. For exam...
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Answered by Rory H. • Politics tutor
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