book Maths Puzzle Numerical Ability

Write the equation of the line which has a y intercept (0,5) and is perpendicular to the line with equation y= 3x + 1

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i neede help with dis question plz
show that there are nine pairs of positive integers (m,n) such that m^2+2n^2 -10m-20n=0
thank u foh ur help find the equation for the parabola with focus (1,4) and directrix x=-3