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Solve the simultaneous equations. 2x + y = 18 x - y = 6

2x + y = 18x - y = 6. There are a few methods you can use to tackle simultaneous equations. The one I find the easiest is making one of the unknowns a subject and plugging it back into the other equation. In...
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Answered by Sofia U. • Maths tutor
4148 Views

What is completing the square and how do I do it?

Completing the square is a method of solving quadratic equations that can't be factorised. The end goal is to express the quadratic in the form:(x + a) 2 = -bWhich allows us to root both sides and find our s...
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Answered by Henry J. • Maths tutor
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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
10753 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
9190 Views

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
14157 Views