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Simultaneous equation: (x-3y)=9,(2x+3y)=0

Using one of the equations we express either x in the form of y, or y in the form of x. We then put this expression of x/y into the other equation. This allows us to calculate the numerical values of both x ...
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Answered by Kerushan T. • Maths tutor
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Describe what happens to sodium and chlorine in a reaction to make Sodium cholride, you may use diagrams to help you.

As Sodium is a metal and Chlorine is a non-metal they will undergo an ionic reaction in which Sodium will lose an electron and donate it to the Chlorine atom which will gain an electron. This will create a p...
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y = 4(x^3) + 7x ... Find dy/dx

This is a simple differentiation question. To start, you need to know the general method of differentiation. This is: if y = Axb then dy/dx = (A*b)x b-1 There are two terms to differentiate in this problem, ...
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Answered by Emilio E. • Maths tutor
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To what extent might a government implement an expansionary fiscal policy?

An expansionary fiscal policy is where a government decides to decrease taxes and increase public spending. An expansionary fiscal policy will usually take place when a government is not in a relatively larg...
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Answered by Joseph V. • Economics tutor
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ABCD is a rhombus on a graph. B(7,10). AC: y=7-4x. Find an equation for DB in the form tx+py+r=0 where t,p&r are integers.

AC and DB must be perpendicular therefore m 1 m 2 = -1. (we can work out the gradient of DB)-4 m 2 = -1 -----> m 2 = 1/4The equation of a line is y-y 1 =m(x-x 1 ) (sub in x, y and gradient values)y - 7 = ...
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Answered by Alexander L. • Maths tutor
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