[size=150][color=#a61c00]If a line passes through a point [/color][math]P\left(x_1,y_1\right)[/math][color=#a61c00] and has a slope [/color][math]m[/math][color=#a61c00] then its equation is of the form [/color][math]\left(y-y_1\right)=m\left(x-x_1\right)[/math][color=#a61c00] provided [/color][math]m[/math][color=#a61c00] is defined.[/color][/size]