exam Maths Puzzle Numerical Ability

solve the following simultaneous equations
3x+2y=12

5x-2y+4

3x+5y=26

2x+3y=16

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exam Other Question

Which intervals are decreasing?
f(x) = x^3 � 12 x^2 + 36x + 1
I came up with (-6, -2), is this correct?

Thank you for inspecting this problem!

Also, I am trying to find t Let's say a random variable 'y' is obtained from another random variable 'x' by the transformation y = ax+b where a,b are constants.

Prove 1. μy = a*μx + b
2.