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Solve the simultaneous equations: 4x+5y = 38 , x-y = 5

Firstly number the two equations 1 and 2 for simplicity. To solve this we want to eliminate one of the variables, x or y, so we start by looking at the equations and seeing if we can add or subtract them fro...
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Answered by Ali A. • Maths tutor
4949 Views

A common question would be how to factorise into two brackets, for example x^2 + 5x = -6

The first thing you must do is get all the terms on the same side, which we do by adding 6 to both sides : x^2 + 5x + 6 = 0. Next, we must work out which numbers add to the middle term, and write these down ...
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Answered by Madeleine T. • Maths tutor
4195 Views

Change of subject question. Make 'a' the subject of the formula v = u + at.

Rule: An equation must be balanced. Therefore, in order to keep the equation balances, what you do to one side you must do to the other side. Change of subject questions require you to isolate the required l...
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Answered by Sherin W. • Maths tutor
25127 Views

How to solve simultaneous equations with two unknowns?

There are two methods for solving simultaneous equations, the algebraic method or graphic method. While using graphs is a useful visual way to solve simultaneous equations, this is more time consuming and sh...
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Answered by Emily H. • Maths tutor
24611 Views

Solve x^2 + 15x = - 50

x 2 + 15 x + 50 = 0 (rearrange by adding 50 to both sides) (x + 10)(x + 5) = 0 (factorise the quadratic equation) x + 10 = 0 or x + 5 = 0 (for the above to equal zero, at least one of the bracketed terms mus...
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Answered by Julia S. • Maths tutor
9738 Views