exam Maths Puzzle Numerical Ability

HELP!

I am stuck on how to figure out solution sets. For example, I have an equation that goes like this.

y= -x + 1

How do I calculate solution sets?

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exam Other Question

I have no idea how to answer this question.

How do you determine if a polynomial is the difference of 2 squares?
Can you help solve this
2 4
_ + __
3 5
_________
2 3
__ - ___
5 2