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How do I find the equation of a line that's perpendicular to another one?

Remember that the equation of a line is y=mx+c and m is the gradient of the line. The gradient of a perpendicular line will be the negative reciprocal of m ( that just means it will be -1/m). You can then us...
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Answered by Verity P. • Maths tutor
3861 Views

There are three words for 'it' in German - er/sie/es. Which one should I use?

That's right, German has three words for English 'it'! But don't worry, there's a rule which lets you pick the right one! German nouns have grammatical gender and can be masculine (der), feminine (die), or n...
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Answered by Ashley B. • German tutor
6786 Views

What is an equilibrium?

Have you ever tried to run the wrong way down an escalator? then you have experienced a dynamic equilibrium.You are moving up, it is moving down and yet, your actual position isn't changing. In a reaction th...
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Answered by Jemma S. • Chemistry tutor
3468 Views

Solve the simultaneous equations to find the values of x and y: 3x + 5y = -4 and 10x - 4y = -34

Firstly we need to remove one of the variables. We can use the fact that y has different signs to do this. 3x + 5y = -4 multiplied by 4 gives: 12x + 20y = -16 10x - 4y = -34 multiplied by 5 gives: 50x - 20y ...
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Answered by Tutor112326 D. • Maths tutor
5864 Views

Differentiate y =cos^4(x)

Let u = cos xdu/dx = -sin xy = u 4 dy/du = 4u 3 dy/dx = dy/du * du/dx = (4u 3 ) * (-sin x) = 4 cos 3 x * -sin x = -4 cos 3 x sin x
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Answered by Christiyan K. • Maths tutor
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