Question 810195
150 units at 35 pesos 
300 units for 20 pesos 
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(35, 150)
(20, 300)
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user the two-point form:
y - y1 = ( (y2 - y1)/(x2 - x1) )(x - x1)
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y - 150 = ( (300 - 150)/(20 - 35) )(x - 35)
y - 150 = ( (150)/(-15) )(x - 35)
y - 150 = (-10)(x - 35)
y - 150 = (-10)x + 350
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y = (-10)x + 500
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at 15 pesos sales will be (approximately, because this is a demand "model"): 350 units
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