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How do I do simultaneous equations?

example: solve the simultaneous equations 3x+2y=4 and 2x+y=3 1: 3x+2y=4 2: 2x+y=3 want to either get same number of x's or same number of y's in equation 1 and equation 2 easiest way to do this is by making ...
CS
Answered by Cerys S. • Maths tutor
4284 Views

Common mistakes made in A-Level exams

We all make silly mistakes when in comes to Maths, so here are some common mistakes to help you out. 1. Partial Fractions: Many students think x+2/(x+1)^2 becomes A/(x+1) + B/(x+1) This is however incorrect,...
CJ
Answered by Calum J. • Maths tutor
5066 Views

(2x+3)/(x-4) - (2x-8)/(2x+1) =1

(2x+3) (2x+1) = 4x^2 + 8x + 3 (2x-8) (x-4) = 2x^2 - 16x - 32 (4x^2+8x+3) - (2x^2-16x-32) = 1 2x^2 - 8x - 29 = 1 2x^2 - 8x - 30 = 0 x^2 - 4x - 15 = 0 Using the quadratic formula; x = 6.36 or x= -2.36 to 2dp
MA
Answered by Masie A. • Maths tutor
1890 Views

A school has a number of students. One is chosen at random; the probability that the student is female is 2/5. Knowing that there are 174 male students, work out the total number of students in the school.

This is a simple yet standard GCSE question, especially in non-calculator papers. The solution is simple: if the student is picked at random, then the probability 2/5 must represent a ratio where the other s...
AM
Answered by Adam M. • Maths tutor
4939 Views

Shampoo is sold in two sizes. 1) 500 ml for £1.98 2) 3 litres for £12.80 (now 15% off). Which is better value for money?

Firstly we need to work out the new price of the 3 litres of shampoo after 15% has been taken off. Let's use the three step method for percentages. 100% is £12.80 £12.80/ 100= £0.128 1% is £0.128 £0.128 x 85...
FN
Answered by Francesca N. • Maths tutor
4988 Views