# 20 March

👉🏼Make y the subject of $x = \frac{y}{y-5}$

👈🏼Solve the following simultaneous equations:

x2+y2=1

x + 2y = 1

👆🏼Calculate $125^{\frac{2}{3}}$

👇🏼A group of 5 girls and 25 boys sit a test. The mean average mark for the whole class is 82. The mean average mark for the boys is 84. Calculate the mean average mark for the girls.

🖐🏼$f(x) = \frac{4x-1}{x+8}$. Work out f-1(x).