exam Maths Puzzle Numerical Ability

Solve by substitution,state whether it is independent,inconsistent,or dependent.;
x - y = 3
3x -2y = 3

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exam Other Question

The sales tax is $49 for a dining room table that costs $1225. Find the sales tax rate? Please help me to solve this equation:
99wsquared+xcube-81xraised to the 4th power+63w/9wx

Thank you