If the slope of a line and a point on the line are known, the equation of the line can be found using the slope-intercept form, y=mx+b. To do so, substitute the value of the slope and the values of x and y using coordinates of the given point, the determine the value of b.
Using the above technique, find the equation of the line containing the points (-2,8) and (4,-1)
The equation of the line is ?

If the slope of a line and a point on the line are known the equation of the line can be found using the slopeintercept form ymxb To do so substitute the value class=

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Answer:

[tex]y=(\frac{-3}{2} )x + 5[/tex]

Step-by-step explanation:

Only one thing you have to remember here and it is the equation for a linear line. This equation is:
[tex]y-y_{0} = m(x-x_{0})[/tex]

Where m is the slope:

[tex]m=\frac{dy}{dx} =\frac{y_{2}-y_{1} }{x_{2} -x_{1} }[/tex]

Writing the whole thing out using the given data points we get:

[tex]y-8=\frac{(-1)-8}{4-(-2)} (x-(-2))[/tex]

We then just have to equate this to an equation of the form y = mx + b:

⇒ [tex]y=\frac{-9}{6} (x+2) + 8[/tex]

⇒ [tex]y=(\frac{-3}{2} )x+ (\frac{-3}{2})2 + 8[/tex]

⇒ [tex]y=(\frac{-3}{2} )x + (-3) + 8[/tex]

⇒ [tex]y=(\frac{-3}{2} )x + 5[/tex]

And there we go, our equation has been found.