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What is the equation of the line represented by the table below?

[tex]\[
\begin{tabular}{|c|c|}
\hline
$x$ & $y$ \\
\hline
-2 & 16 \\
\hline
-1 & 11 \\
\hline
0 & 6 \\
\hline
1 & 1 \\
\hline
2 & -4 \\
\hline
\end{tabular}
\][/tex]

A. [tex]\( y = -5x + 3 \)[/tex]
B. [tex]\( y = -5x + 6 \)[/tex]
C. [tex]\( y = -3x - 5 \)[/tex]
D. [tex]\( y = -5x + 9 \)[/tex]


Sagot :

To determine the equation of the line that represents the given data points, we need to find the slope ([tex]\(m\)[/tex]) and the y-intercept ([tex]\(b\)[/tex]) of the line in the form [tex]\(y = mx + b\)[/tex].

First, let's find the slope ([tex]\(m\)[/tex]) using two points from the table. We'll use the points [tex]\((-2, 16)\)[/tex] and [tex]\((-1, 11)\)[/tex]:

[tex]\[ m = \frac{y_2 - y_1}{x_2 - x_1} \][/tex]

Plugging in the values, we get:

[tex]\[ m = \frac{11 - 16}{-1 - (-2)} = \frac{-5}{1} = -5 \][/tex]

Next, we need to calculate the y-intercept ([tex]\(b\)[/tex]). We can use any of the given points and the slope we just calculated. Let's use the point [tex]\((-2, 16)\)[/tex]:

[tex]\[ y = mx + b \][/tex]

Plugging in the slope and the coordinates of the point, we get:

[tex]\[ 16 = (-5)(-2) + b \][/tex]

[tex]\[ 16 = 10 + b \][/tex]

Solving for [tex]\(b\)[/tex]:

[tex]\[ b = 16 - 10 \][/tex]

[tex]\[ b = 6 \][/tex]

Therefore, the equation of the line is:

[tex]\[ y = -5x + 6 \][/tex]

So, the correct equation corresponding to the given data points is [tex]\(y = -5x + 6\)[/tex].

Checking the provided options:
A. [tex]\( y = -5x + 3 \)[/tex]
B. [tex]\( y = -5x + 6 \)[/tex]
C. [tex]\( y = -3x - 5 \)[/tex]
D. [tex]\( y = -5x + 9 \)[/tex]

The correct answer is B: [tex]\(y = -5x + 6\)[/tex].
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