Question (a)
Let the cost function be
"y(x)=kx+b,\\,\\,\\,\\text{where}\\,\\,\\,x\\,\\,\\,\\text{ is the number of chairs}"
To determine the constants, we use the conditions of the problem
"\\left\\{\\begin{array}{l}\ny(100)=2200=100k+b\\\\\ny(300)=4800=300k+b\n\\end{array}\\right.\\rightarrow\\\\[0.3cm]\n\\left\\{\\begin{array}{l}\n2200=100k+b\\\\\n4800-2200=(300k+b)-(100k+b)\n\\end{array}\\right.\\rightarrow\\\\[0.3cm]\n\\left\\{\\begin{array}{l}\n2200=100k+b\\\\\n2600=200k\\to k=\\displaystyle\\frac{2600}{200}=13\n\\end{array}\\right.\\rightarrow\\\\[0.3cm]\n\\left\\{\\begin{array}{l}\n2200=100\\cdot 13+b\\to b=900\\\\\nk=13\n\\end{array}\\right.\\rightarrow\n\\boxed{\\left\\{\\begin{array}{l}\nb=900\\\\\nk=13\n\\end{array}\\right.}\\\\[0.3cm]"
Conclusion,
"\\boxed{y(x)=13x+900-\\text{cost function}}"
Question(b)
The slope of this function is
"\\boxed{k=13}"
This ratio means that for every chair sold we get $13.
Question(c)
The intersection with the "Oy-" axis is
"y(0)=13\\cdot 0 +900\\longrightarrow\\boxed{y(0)=900}" This number shows fixed production costs such as: rental of premises; salary; rent / purchase of equipment and materials, etc.
ANSWER
(a)
"y(x)=13x+900-\\text{cost function}"
(b)
The slope of this function is
"k=13"
This ratio means that for every chair sold we get $ 13.
(c)
The intersection with the Oy− axis is
"y(0)=900"
This number shows fixed production costs such as: rental of premises; salary; rent / purchase of equipment and materials, etc.
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