Question

The graph shows the words per minute Minka can type. Which is the equation of the line represented in the graph? (1 point) Responses y=1403x+403 y is equal to 140 thirds x plus 40 thirds y=403x+50 y is equal to 40 thirds x plus 50 y=3140x−72 y is equal to 3 over 140 x minus 7 halves y=403x+1403

Image shows a line going through 1, 60 and 7, 140

Answer 1

To find the equation of the line given two points, we can use the slope-intercept form \( y = mx + b \), where \( m \) is the slope and \( b \) is the y-intercept.

Given the points (1, 60) and (7, 140), we can find the slope \( m \) using the formula:

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

Here, \( (x_1, y_1) = (1, 60) \) and \( (x_2, y_2) = (7, 140) \).

Calculating the slope:

\[
m = \frac{140 - 60}{7 - 1} = \frac{80}{6} = \frac{40}{3}
\]

Now that we have the slope, we can use one of the points to find the y-intercept \( b \). We can use the first point (1, 60):

\[
y = mx + b \implies 60 = \frac{40}{3}(1) + b
\]

Solving for \( b \):

\[
60 = \frac{40}{3} + b
\]
\[
b = 60 - \frac{40}{3} = \frac{180}{3} - \frac{40}{3} = \frac{140}{3}
\]

The equation of the line is:

\[
y = \frac{40}{3}x + \frac{140}{3}
\]

Now we match this against the provided responses. The equivalent response looks like:

\[
y = \frac{40}{3}x + 50
\]

We can convert \(\frac{140}{3}\) to a decimal or a mixed number for comparison:

\(\frac{140}{3} = 46.67\) and \(50\) can be viewed as approximate but does not exactly match our calculation.

So the final equation of the line, in terms of responses you provided, that matches closely is:

\[
y = \frac{40}{3}x + 50
\]

Therefore, the correct response is:

**y = 40/3 x + 50**