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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 equa...

Answered by Cerys S. • Maths tutor

3275 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 othe...

Answered by Adam M. • Maths tutor

4027 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....

Answered by Francesca N. • Maths tutor

3887 Views

How do you factorize a quadratic equation which has a coefficient of x^2 other than 1?

Factorise 6x²+ x - 2 = 0

Firstly, multiply the coefficient of x² by the last number:

6 x -2 = -12

Answered by Aleezeh A. • Maths tutor

2666 Views

Kenny has £3200 in a savings account. After a year, the bank pays him interest increasing his balance to £3360. What percentage rate was applied to the account?

Kenny originally had £3200 After a year, he had £3360 £3360 - £3200 = £160 160/3200 = 0.05 0.05 x 100 = 5% Therefore, a 5% interest rate was applied to Kenny's account

Answered by Megan C. • Maths tutor

5116 Views