You have two points: (4000,22000) and (6000,30000)
It might make things less complicated if you drop all those extra zeroes, making your points (4,22) and (6,30) where the values are measured in thousands.
The slope of the line is, as usual, (30-22)/(6-4) = 4
So, using the point-slope form of the line,
y-22 = 4(x-4)
is one way to write it.
As the number of units manufactured increases from 4000 to 6000, the total cost
of production increases from Rs. 22,000 to Rs. 30,000. Find the relationship between the cost
(y) and the number of units (x), if the relationship is linear.
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