The average cost of producing a security system based on the total number of systems produced, x, is represented by the following function. f(x) =400+20,000/x

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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 )

1. 3. can also be expressed as (22/7)

2. -4.5

3. 3.6

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