book Maths Puzzle Numerical Ability

solve the system of equations 3y-2x=4 and 2y+4x=8

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book Other Question

How do I find missing angle measures when I only have 1 angle measure such as 70 degrees or 25 degrees or 30 degrees? I want to know. How you would put these phrases into algebraic expressions- -
1----You will be paid double the amount per hour.
2----five more than triple a number.
3----the inh