exam Maths Puzzle Numerical Ability

How do I do this problem..thank you*

find the distance between -1/4 and 3/5

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exam Other Question

1)what is the slope of the line givin by y= -3x+2


2) write the equation, in slope-intercept form, of the line containing the points (-1,5) and (1,3)
pls, help me sketch the graph 7x-3y=21`