How do we approach this when we have 4 variables and only given 2 ?The stellar magnitude scale compares the brightness of stars using the equation m_{1}- m_{2}= log(base 10) (b_{1}/ b_{2}). Sirius is the brightest star appearing in our sky, with a magnitude of 1.5. How much brighter does Sirius appear than Neptune, whose apparent magnitude is 0.12.

1.5 - 0.12 = log(base 10) (b_{1}/ b_{2}) then what?