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some situations two unknown is likely to solve the x and the y

and it is more likely many equations given with only x and y variable are given

for two unknown variables it only takes up to two equations to solve the x and y

so you need an algebraic skills like an animal to solve the equations given, by any method that you like.

methods are

where you in terms the another variable to another variable from either first or second equation given

then substitute it to the remaining equation then you can come up to the answer to the first variable then substitute it from the rest

where you subtract the two equation and eliminate the one variable by multiplying the equation that you choose with the factor that can make the difference of the two same variable to zero then comes up the answer of the first value then back to substitution then substitute to solve the remaining variable

last is

by

it is a long process and you will learn it when you are in higher years