exam Maths Puzzle Numerical Ability

A HAS COORDINATES (6,-8 AND B HAS COORDINATES -7,-1 FIND AB____________AND MIDPOINT OF _
AB________

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I cannot understand how to do these type of questions at all...Can you please help me and thanks:)

Page 575
Number 2
I have to write in standard form and determine the values of a,b, and c....

x^2 + 6x - 5 = 0
2X-3/3=3x+2/5