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Question Progress
213 Marks
Homework Progress
20/ 22 Marks
Subn
Andy was given data to draw 3 scatter diagrams.
He also decided to draw a line of best fit on each one.
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Diagram B
Diagram C
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Diagram A
a) What type of correlation is shown in diagram A? negative
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b) Which diagram shows the strongest correlation?
c) Which line of best fit should not have been drawn?
Give a reason for your answer. B I
Overview
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Scatter Diagrams
DO
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5x + 3y = - 4

step-by-step explanation:

the equation of a line in standard form is

ax + by = c ( a is a positive integer and b, c are integers )

express the line first of all in slope- intercept form

y = mx + c ( m is the slope and c the y-intercept )

to calculate m use the gradient formula

m = ( y₂ - y₁ ) / ( x₂ - x₁ )

with (x₁, y₁ ) = (7, - 3) and (x₂, y₂ ) = (4, - 8)

m = = -

y = - x + c ← is the partial equation

to find c substitute either of the 2 points into the partial equation

using (4, - 8 ), then

- 8 = - + c ⇒ c = -

y = - x - ← in slope-intercept form

multiply all terms by 3 to eliminate the fractions

3y = - 5x - 4 ( add 5x to both sides )

5x + 3y = - 4 ← in standard form

i would you but i don't under stand the qustion

step-by-step explanation: