exam Maths Puzzle Numerical Ability

If I compared equations with one variable to equations with two variables.
How are they alike? How are they different?

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exam Other Question
Ok I got the rest of the ones completed but i'm stuck on these three. please help

I am suppose to constuct truth tables and then determine how many cases are true for each state

7x-2y=-2 3x-3y=7
Solve the following system of linear equation by elimination