The slope-intercept form of the equation representing the relation between sales price and number sold is given as:
[tex]y = -1000x + 11000[/tex]
Given that:
- x represents sales price in dollars.
- y represents numbers of Fun Noodles sold
- When x = $2, y = 9000 packets.
- When x = $5, y = 6000 packets.
- The relation between x and y is linear.
To find:
Slope intercept form of the equation representing relation between sales price and numbers of items sold.
Formation of equation:
Since it is assumed that there is linear relation between x and y, thus, let the equation be:
[tex]y = mx + c[/tex] , where m represents the slope of the line and c represents the intercept on y axis of the linear line that this equation is representing.
Then, we have that line passing through two points, viz:
[tex](2, 9000)[/tex] and [tex](5, 6000)[/tex]
Since as the price increases from 2 to 5 (ie growth of 3 in value of x), the numbers of items sold decreases from 9000 to 6000 (that means downfall of 3000 in value of y)
Thus, we have rate as: x up by 3 implies y down by 3000
Which can be converted to find the slope as:
[tex]\: \rm slope = m = \dfrac{\text{difference in y}}{\text{difference in x}} = \dfrac{-3000}{3} = -1000[/tex]
Thus, the equation will be:
[tex]y = -1000x + c[/tex]
Evaluating the equation at (2, 9000) to get the value of c:
[tex]y = -1000x + c\\9000 = -1000 \times 2 + c\\9000 + 2000 = c\\c = 11000[/tex]
Thus, the equation of the line representing the relation between sales price and the numbers of Fun Noodles sold will be:
[tex]y = -1000x + 11000[/tex]
Learn more about linear equations here:
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