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    I have attached a photo of the question and the answer becuase it is alot to type , I understand I have to use pytagoras to answer to this question but why do I have to fin the difference x and then the difference in y ,before I put into the pythag formula?
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    read the question again. "The line joining the two points has length .....". To find the length of the line you need to find the difference in y and difference in x. imagine a triangle or draw it out. to go from one point to the other you need to go a certain amount sideways and a certain amount up or down. once you know the length of the x and y direction, you use pythag to find the length of the line
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