8 6
4
2
6
8
-8 -6 -4 -2 0-3
21
.
-6
-8
O A. y -[x]-2
OB. y -[x]+3
O C. y = (x) - 3
O D. y = [x]+2

The required equation of the line is y = [x]+2

From the graph shown, we can see that the line dotted points forms a straight line. We are to find the required equation of the line formed.

The formula for calculating the equation of a straight line is expressed as

y = mx+b where

m is the slope b is the y-intercept

Get the slope 'm'

Using the coordinate points (2, 0) and (4, 2)

Get the y-intercept 'b'

Substitute m = 1 and (2, 0) into y = mx+b as shown;

Get the required equation. Recall that y = mx+b, hence;

Hence the required equation of the line is y = [x]+2

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it costs $20 to interview each person for a survey. find the cost to obtain a +- 3% margin of error.

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