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Solve the simultaneous equations: 3x + y = 19 and x - 2y = -3

First rearrange x - 2y = -3 by adding 2y to each side to give x = -3 + 2ySubstitute this into the first eq. to give 3(-3 +2y) + y = 19Expand brackets first: -9 + 6y + y = 19Rearrange and simplify by colle...

Answered by Jessica M. • Maths tutor

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How can I write a good introduction

An introduction begins an essay in the most clear and concise way possible. It's important to immediately state what texts you'll be analysing and refer to any authors using their whole name the first tim...

Answered by Kasia L. • English Literature tutor

3529 Views

Is the concept of power central to our understanding of global politics?

Power is a key concept within international relations and the global sphere. This essay aims to evaluate the means through which power can be exerted and the centrality of power within global politics.

Answered by Caitlin B. • Politics tutor

2558 Views

Explain the trend in reactivity of the elements in Group 7.

The Halogens decrease in reactivity as you descend through the group. The atoms increase in size and Mr as you go down the group. Therefore their outer electrons are further away from the positive charge ...

Answered by Kirsten S. • Chemistry tutor

7358 Views

Derive the Drift Velocity Equation

(The drift velocity is the average velocity of a charge carrier due to an electric field)Consider a conductor with length l and cross sectional area AThere are n electrons per unit volum...

Answered by Francois M. • Physics tutor

4053 Views