First solve for m:
[tex]4m+8=-5n\ \ \ \ |-8\\\\4m=-5n-8\ \ \ \ |:4\\\\m=\dfrac{-5n-8}{4}[/tex]
Next put the values of x to the equation:
[tex]n=-1\\\\m=\dfrac{-5(-1)-8}{4}=\dfrac{5-8}{4}=-\dfrac{3}{4}\\\\n=0\\\\m=\dfrac{-5(0)-8}{4}=\dfrac{-8}{4}=-2\\\\n=1\\\\m=\dfrac{-5(1)-8}{4}=\dfrac{-5-8}{4}=-\dfrac{13}{4}[/tex]
