Ametalworker has a metal alloy that is 20% copper and another alloy that is 75% copper. how many kilograms of each alloy should the metalworker combine to create 120 kg of a 53% copper alloy?

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y = 6x -3y -12

y +3y +12 = 6x

=> . x = { 2y / 3 +2 } this is equation of line in terms of x

=> . if line meets the x-axis the co-ordinates of meeting point would be ( x , 0 )

=> . x = 2 ( 0 ) / 3 + 2

=> . x = 2

so, the point is ( 2 , 0 )