exam Maths Puzzle Numerical Ability

How do I graph x=3?

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exam Other Question

i have to express to the simplest form but i am confused
2/5-y/y-2
=-3y-2
over
5(y-2)
I need help to solve this problem I am having problems figuring it out

Find the x - intercepts y=x^2-2x+4
thanks a million