book Maths Puzzle Numerical Ability

[2x+3/2]2(square)=49/25

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Having trouble with this.

5. Suppose you travel north for 65 kilometers then travel east 75 kilometers. How far are you from your starting point?
Answer:
Show work in this space. I have a problem that has (1,5) and (2,7) i have to figure out what the equation is for the slope-intercept form.