book Maths Puzzle Numerical Ability

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

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book Other Question

How much does a fish weigh if its tail weighs 4 kilograms (kg), its head weighs as much as its tail and half its body, and its body weighs as much as its head and tail together? 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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