For any graphable equation, the software first manipulates it into its standard form before graphing; for a linear equation, that form is "y=mx+b" where the slope "m" may then be determined by inspecting the equation (for example, in the equation "y=-2x+4" "-2" is the correct value for "m").

The provided equation "y=(1/3)x" was provided in the standard form, hence no simplification is possible unless you wish to use 'real numbers' rather than 'integer', then 1/3 would become 0.3333333...

The slope is 1/3 and the y-intercept is 0, so that line will cross through the origin.