$\displaystyle f(x)=- \frac{1}{2}x+1$\displaystyle f(x)=- \frac{1}{2}x+1

$\displaystyle f(x)=- \frac{1}{3}x+ \frac{1}{3}$\displaystyle f(x)=- \frac{1}{3}x+ \frac{1}{3}

$f(x)=-2x+2$f(x)=-2x+2

$f(x)=-3x+1$f(x)=-3x+1