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Find the rational function which represents the graph. If you could help with both sections that would be amazing

Find the rational function which represents the graph. If you could help with both-example-1
User Phillis Peters
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1 Answer

22 votes
22 votes

SOLUTION

Given the question in the image, the following are the solution steps to answer the question.

STEP 1: Write the given points on the graph


\begin{gathered} \text{ Points are given in the form of }(x,y) \\ \therefore\text{ points are:} \\ (x_1,y_1)=(2,0) \\ (x_2,y_2)=(0,-2) \end{gathered}

STEP 2: Write the slope-intercept form of the equation of a line


\begin{gathered} y=mx+b \\ \text{where m is the slope and b is the y-intercept} \end{gathered}

STEP 3: Write the formula to get the equation of a line using two given points


(y-y_1)=m(x-x_1)

STEP 4: We use the given points to get the slope


m=(y_2-y_1)/(x_2-x_1)

STEP 5: Substitute the given points into the formula in step 4 to get the slope


m=(-2-0)/(0-2)=(-2)/(-2)=1

STEP 6: Since we have a slope and two points, we use the formula in step 3 to get the function that represents the line


\begin{gathered} (y-y_1)=m(x-x_1) \\ U\sin g\text{ point }(2,0) \\ (y-0)=1(x-2) \\ y=1(x-2) \\ y=x-2 \end{gathered}

STEP 7: We get the rational function of the line using the given hole


\begin{gathered} \text{hole}=(5,3) \\ \text{equation of line }\Rightarrow y=x-2 \\ \\ To\text{ get the rational function, we write the function of each coordinate that makes it undefined} \\ (5,3)\Rightarrow x=5\Rightarrow x-5 \\ (5,3)\Rightarrow y=3\Rightarrow y-3 \\ We\text{ divide the equation of the line in step 6 by the expressions above} \\ \text{Hence, the rational function is given as:} \\ (y)/(y-3)=(x-2)/(x-5) \end{gathered}

Hence, the rational function representing the line with the given hole is:


(y)/(y-3)=(x-2)/(x-5)

User Andorov
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