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[latex](x_1;\ y_1);\ (x_2;\ y_2),\ the\ slope\ m=\dfrac{y_2-y_1}{x_2-x_1}[/latex] [latex](1;-5)\to x_1=1;\ y_1=-5\\(4;\ 1)\to x_2=4;\ y_2=1[/latex] subtitute [latex]m=\dfrac{1-(-5)}{4-1}=\dfrac{1+5}{3}=\dfrac{6}{3}=2[/latex]
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