exam Maths Puzzle Numerical Ability

what is the solution to- 9x-3y=3
3X+8Y=-17

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exam Other Question

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. If you mix 140 mL of a 60% acid solution with 200 mL of a 30% solution you get a 350 mL of a _____% solution.