exam Maths Puzzle Numerical Ability

Please help! Detwrmine the equation of the line that has a slope of 3 and passes through the point (-2,1). Write the equation in standard form

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Anybody know this one

x^2+4x+1>0

thanks for your time If x is the sum of all prime factors of 38, and if y is the sum of all prime factors of 84, what is the value of x-y? Please explain prime factors.