If ross earns a 5% commission on what he sells, how much he earn on $60.

Divide 5%/100% to get 0.05. multiply that by $60*0.05=$3 

Ifound this on google “that means that the graph of a function with direct variation has these features: it is a straight line: because the slope is the ratio y/x = k. it passes through the origin (0,0): because y = kx = k (0) = 0.” i hope this you for what your looking for