exam Maths Puzzle Numerical Ability

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Write in slope-intercept form the equation of the line passing through (1,3) and (-5,-1). Show that this line is perpendicular to the line y=-3/2x+17. thanks

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A course consits of four 100 point exams. A student scores 60 points on the first exam. What average must be obtained on the next three exams to obtain an overall average of 75%? The sum of a number and its square is 12. Find the number.