exam Maths Puzzle Numerical Ability

how many furlong per fortnite equals 50 miles per hour

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My study question asks....Solve the following systems of equation by any method.

All I am asking for is the name of a method so I can look up the order or way to solve it.

3x-2y=12

and

2x+y=8

Thanks! your final answer for each part must be a polynomial in standard form

a) addition (12y^3-20y^2-10y+19)+(15y^4-17y^3+24y^2+29y-15)

b) subtraction (-19y^3+19y^2+3y+19)-(-8y^3-30y^2-2y-25)