One equation and 2 variables has an infinite amount of solutions.

Exactly - for that example, give one of the unknowns any real number apart from 0 and you can find another real number (easily) to apply to the other unknown to make the equation work.

Generally speaking, simultaneous equations are needed when you're dealing with more than one unknown.

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Basic linear algebra says that any system of equations with more unknown variables than equations has infinite solutions. This is a system of 1 equation with 2 unknown variables. There are infinite solutions to this problem therefore it is degenerate. Go back to middle school and learn algebra.

do you realise how that's different to the question that you asked? because there is more information given by that second equation.

it should be simple enough to do in your head.

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