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Nuetrik [128]
3 years ago
6

use the scatter plot and the trend line to show answer a-c. Write an equation for the trend line. predict the value of y when x

=21 Predict the value of x when y = 150
Mathematics
1 answer:
finlep [7]3 years ago
4 0

Answer:

See Explanation

Step-by-step explanation:

This question is incomplete, as the required scatter plot is not included in the question. I will answer your question with the attached plot.

Solving (a): The equation

Pick any two  pointson the trend line

(x_1,y_1) = (30,40)

(x_2,y_2) = (80,70)

y = 0.6x + 22

Calculate the slope (m)

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

m = \frac{70 - 40}{80-30}

m = \frac{30}{50}

m = 0.6

The equation is then calculated as:

y = m(x - x_1) + y_1

This gives:

y = 0.6(x - 30) + 40

y = 0.6x - 18 + 40

y = 0.6x + 22

Solving (b): y, when x = 21

y = 0.6x + 22

Substitute x = 21

y = 0.6 * 21 + 22

y = 12.6 + 22

y = 34.6

Solving (c): x when y=150

y = 0.6x + 22

Substitute y=150

150 = 0.6x + 22

Collect like terms

0.6x = 150 -22

0.6x = 128

Solve for x

x = \frac{128}{0.6}

x = 213.3

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