exam Maths Puzzle Numerical Ability

Find the slope of a line between the points (5,3) and (-2,3)

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exam Other Question

Find the slope and y-intercept of the graph of the equation.
y=7x+1 If x the sum of all prime factors of 38, and if y is the of all prime factors of 84, what is the value of x-y?

Answer is 9.How?