exam Maths Puzzle Numerical Ability

i have to find the distances between the two given points (5,1)and (8,5)

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exam Other Question

solve using the square root property

2x^2-35=15
Find an equation for the line with y-intercept 3 that is perpendicular to the line y=2/3x-4. My answer is 2y=6-3x could this be right. Thanks for checking.