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iren2701 [21]
3 years ago
8

Shannon drew the line of best fit on the scatter plot shown below:

Mathematics
2 answers:
N76 [4]3 years ago
6 0
Using the points (0,14) and (10,0), the gradient of the line is (14-0)/(0-5) which simplifies to -7/5.

From these points, we can also see that when the x value is zero, the y value is 14. Therefore the y-intercept is 14.

We can then put this into the equation of a straight line, y=mx+c:

y = (-7/5)x + 14
andrew11 [14]3 years ago
6 0

Answer:

Option A.

Step-by-step explanation:

If a line passes through two points (x_1,y_1) and (x_2,y_2), then the equation of line is

y-y_1=\frac{y_2-y_1}{x_2-x_1}(x-x_1)

It is given that the line of best fit passes through the points (0,14) and (10,0).

Using the above formula the equation of best fit line is

y-14=\frac{0-14}{10-0}(x-0)

y-14=\frac{-14}{10}(x)

y-14=-\frac{7}{5}(x)

Add 14 on both sides.

y-14+14=-\frac{7}{5}(x)+14

y=-\frac{7}{5}(x)+14

The equation of best fit line is y=-\frac{7}{5}(x)+14.

Therefore, the correct option is A.

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