exam Maths Puzzle Numerical Ability

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!

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exam Other Question

The temperature on a summer afternoon is 85 degrees F. Define a variable and write an expression to find the temperature after it changes. Then evaluate your expression for a dec Multiply:
(8√[6] + 3√[2])(4√[6] - 5√[2])

I believe FOIL is used here. I also think the answer should have no decimals.

Thanks for helping!!!