Användare:17riwi

=== Att hitta "k" ===

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

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

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

=== Att hitta "m" ===

[math]\displaystyle{ y = k*x + m }[/math]

[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

[math]\displaystyle{ f(x) = -0,75x + 1,75 }[/math]