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Solve the simultaneous equation: 3x+y =-4 and 3x-4y=6

The first step would be to rearrange the first equation to make y the subject: 3x+y=-4 ----> y=-4-3x Next we want to substitute this value of y into the second equation 3x-4y=6 -----> 3x-4(-3x-4)=6 Nex...
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Answered by Samuel P. • Maths tutor
10831 Views

From the 2016 OCR B paper A ball is thrown at an angle of 30 Degrees to the horizontal. The initial kinetic energy of the ball is K. Air resistance is negligible. What is the kinetic energy of the ball at the maximum height.

This is a common class of question concerning projectile motion and the independence of orthogonal forces. First the student should sketch the problem an label the forces, In doing this they will see that th...
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Answered by Andrew R. • Physics tutor
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In terms of electron transfer describe what happens when one atom of calcium reacts with two atoms of chlorine and give the ions that are formed.

When these atoms react together Calcium chloride, CaCl 2 , is formed. Calcium atoms have two electrons in their outer shell, which can be determined from the fact they are in group 2 of the periodic table. C...
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Answered by Lauren M. • Chemistry tutor
14270 Views

What are the differences between shareholder and stakeholder?

Shareholders are individuals (or groups of individuals, companies, institutions, etc.), who own a part of a business through the ownership of its shares. A stakeholder is an individual (or a group), that is ...
AS
4339 Views

How do I form the perfect tense in French?

The perfect tense is used in French to described completed actions in the past, such as 'I ate an apple' or 'I have done my homework' .e.g. Je mange une pomme = I eat an apple (present tense) // J'ai mangé u...
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Answered by Hannah V. • French tutor
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