book Maths Puzzle Numerical Ability

write an equation of the line passing through the given points. Write the quation in the form y= mx + b.

Need to check my break down of the answer. new at this

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I need to know the symbols that is used to show the relationship between 2 intersecting lines. I know if the lines (AB and DC) are parallel the answer would be AB // DC, but what Find and simplify P(a+h)-P(a) given P(x)=x^2-2x