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koffecienter

[math]\displaystyle{ x1 = -3 }[/math]

[math]\displaystyle{ x2 = 5 }[/math]

[math]\displaystyle{ y1 = 4 }[/math]

[math]\displaystyle{ y2 = -2 }[/math]

Hitta K-värdet

[math]\displaystyle{ k = \frac {y_2 - y_1}{x_2 - x_1} }[/math]

[math]\displaystyle{ k = \frac {-2 - -4}{5 - (-3)} }[/math]

[math]\displaystyle{ k = \frac {-6}{8} }[/math]

[math]\displaystyle{ k = -0,75 }[/math]

Hitta M-värdet

[math]\displaystyle{ 4 = -0,75*-3 + m }[/math]

[math]\displaystyle{ 4 = 2,25 + m }[/math]

[math]\displaystyle{ m = 4 - 2,25 }[/math]

[math]\displaystyle{ m = 1,75 }[/math]

Svar

Den räta linjens ekvation: [math]\displaystyle{ f(x)=-0.75x+m }[/math]