Top answers

Maths
GCSE

Solve the simultaneous equations: 2x-3y = 24 and 6x+2y = -5

There are numerous alternative ways to solve these simultaneous equations. For this problem, one of the simplest methods is to multiply the first equation by 3, so that we get 6x in both equations:

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AS
Answered by Augustinas S. • Maths tutor
3868 Views

Rearranging formulae

Rearrange 1/u + 1/v = 1/f

to make u the subject of the formula. Give your answer in its simplest form.

There are a number of ways to approach this problem.

RS
Answered by Robert S. • Maths tutor
11670 Views

You put £800 in a bank account, which earns you 3.5% compound interest per year. How much interest would you have earned after seven years?

We start with £800 in the bank. As we are earning compound interest, it means that each year we get 3.5% of the original £800, plus 3.5% of any interest that has already been earned...

PM
Answered by Philippa M. • Maths tutor
4683 Views

Solve the simultaneous equations (1) 2a - 5b = 11 (2) 3a + 2b = 7

(1)x2 4a - 10b = 22(2)x5 15a + 10b = 35(1) + (2) 19a = 57a = 3sub a = 3 into (1)2(3) - 5b = 116 - 5b = 11-5b = 55b = -5b = -1

HC
Answered by Hannah C. • Maths tutor
8875 Views

A picture is bought at a sale for £40. It is laster sold for £50. What is the percentage profit?

percentage profit = percentage increasepercentage increase = (difference/original) x 100                 = (50 - 40)/40) x100=25%

HC
Answered by Hannah C. • Maths tutor
5464 Views

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