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A linear function contains the points (-3, -7) and (6,-4). Which of the following points does it also include?
A.(-9,3)
B.(3,-6)
C.(12,2)
D.(9,-3)


Sagot :

The given points defines a line from which the linear function can be

determined and the included point on the line can be found.

The point also included on the line is D. [tex]\underline {(9, \, -3)}[/tex]

Reasons:

The given points on the linear function are; (-3, -7), (6, -4)

The slope of the line is given as follows;

[tex]Slope, \, m =\dfrac{y_{2}-y_{1}}{x_{2}-x_{1}}[/tex]

Therefore, we get;

[tex]Slope, \, m =\dfrac{-4-(-7)}{6-(-3)} = \dfrac{1}{3}[/tex]

The equation of the function is therefore;

[tex]y - (-4) = \dfrac{1}{3} \cdot (x - 6)[/tex]

[tex]y = \dfrac{x}{3} - 6[/tex]

Graphing the above equation on the calculator gives the points;

(-9, -9), (3, -5), (12, -2), and (9, -3)

Therefore;

The point also included on the line is D. [tex]\underline {(9, \, -3)}[/tex]

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