x denotes the price per liter, and y denote the quality of the milk sold at this price.
Since there is a linear relationship between the price and the quality, the line representing this
Relationship passes through (14, 980) and (16, 1220).
How many liters could he sell weekly at Rs. 17 per liter.
So, the equation of the line passing through these points is
⇒ y – 980 = 120(x - 14)
⇒ 120 x - y -700 = 0
When x = 17 then we have,
120(17) – y – 700 = 0
⇒ y = 1340
Hence, the owner of the milk store can shell 1340 litres of milk at Rs. 17 per litre.
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