AnswersMathematics 8Using Equations to Represent Trend Lines

Using Equations to Represent Trend Lines — Quiz Answers

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1
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How can Jordan use the plot to check the reasonableness of his answer?

A
His slope should be negative because the x -coordinate of each plotted point is less than the y -coordinate.
B
His slope should be positive because the trend line is slanted up to the right.
C
His slope should be negative because there are plotted points not on the line.
D
His slope should be positive because the coordinates of all the plotted points are positive.
2
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Which equation of a line of best-fit reflects a negative correlation?

A
y is equal to 1 over 70 x plus 312
B
y is equal to 8 x minus 2
C
y is equal to negative 83 over negative 27 x plus 15
D
y is equal to negative 6 x plus 13
3

Determine the equation for the trend line shown in each graph. Move the correct answer to each box. Not all answers will be used.

Answer:

y=(10)/(9)⁢x|y=(9)/(10)⁢x

4

Darren is finding the equation in the form y is equal to m x plus b for a trend line that passes through the points open paren 2 comma 18 close paren and open paren negative 3 comma 8 close paren Which value should he use as b in his equation?

A
14
B
negative 34
C
2
D
negative 19
5

Which is the equation of a trend line that passes through the points open paren 3 comma 95 close paren and open paren 11 comma 12 close paren ? Round values to the nearest ten-thousandths.

A
y is equal to negative 10 point 3 7 5 x plus 126 point 1 2 5
B
y is equal to 0 point 0 9 6 x plus 10 point 9 4 4
C
y is equal to negative 0 point 0 9 6 x plus 13 point 0 5 6
D
y is equal to 10 point 3 7 5 x plus 63 point 8 7 5
6

What is the slope of a trend line that passes through the points open paren negative 3 comma 3 close paren and open paren 18 comma 26 close paren ?

A
15 over 29
B
29 over 15
C
23 over 21
D
21 over 23
7

What is the slope of a trend line that passes through the points open paren 1 comma 3 close paren and open paren 10 comma 25 close paren ?

A
negative 15 halves
B
24 sevenths
C
negative 1 half
D
22 ninths
8

Which is the equation of a trend line that passes through the points open paren 7 comma 450 close paren and open paren 14 comma 401 close paren ?

A
y is equal to negative 7 x plus 499
B
y is equal to 1 seventh x plus 449
C
y is equal to 7 x plus 401
D
y is equal to negative 1 seventh x plus 451
9

What is the slope of a trend line that passes through the points open paren 5 comma 80 close paren and open paren 7 comma 65 close paren ?

A
negative 15 halves
B
2 over 15
C
15 halves
D
negative 2 over 15
10

What was the first error that Mia made?

A
Mia switched the numerator and the denominator.
B
Mia subtracted in the wrong order.
C
Mia used subtraction instead of addition.
D
Mia simplified incorrectly and made the slope positive.

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Using Equations to Represent Trend Lines — Quiz…