Questions: This table of values represents a linear function.
x y
------
-3 14
2 -1
7 -16
a. What is the slope? m=
b. What is the y-intercept? b=
c. Enter an equation in the form y=mx+b that represents the function defined by this table of values.
Transcript text: This table of values represents a linear function.
\begin{tabular}{|c|c|}
\hline $\boldsymbol{x}$ & $\boldsymbol{y}$ \\
\hline-3 & 14 \\
\hline 2 & -1 \\
\hline 7 & -16 \\
\hline
\end{tabular}
a. What is the slope? $m=$ $\square$
b. What is the $y$-intercept? $b=$ $\square$
c. Enter an equation in the form $y=m x+b$ that represents the function defined by this table of values.
$\square$
Solution
Solution Steps
Solution Approach
To find the slope m of the linear function, use the formula for the slope between two points (x1,y1) and (x2,y2): m=x2−x1y2−y1. Choose any two points from the table to calculate the slope. Once the slope is determined, use one of the points and the slope to solve for the y-intercept b using the equation y=mx+b. Finally, write the equation of the line in the form y=mx+b.
Step 1: Calculate the Slope
To find the slope m of the linear function, we use the formula:
m=x2−x1y2−y1
Using the points (−3,14) and (2,−1):
m=2−(−3)−1−14=5−15=−3.0
Step 2: Calculate the y-Intercept
Next, we calculate the y-intercept b using the slope and one of the points. We can use the point (−3,14):
b=y−mx=14−(−3)(−3)=14−9=5.0
Step 3: Write the Equation of the Line
Now that we have both m and b, we can write the equation of the line in the form y=mx+b:
y=−3.0x+5.0
Final Answer
The slope m is −3.0, the y-intercept b is 5.0, and the equation of the line is:
y=−3.0x+5.0