ont-family: STIXGeneral, STIXGeneral-webfont, serif; font-style: italic; font-weight: 400; color: rgb(0, 0, 0);">h</span><span> is the number of hours an individual works</span></li><li  class = 'S3'><span style="font-family: STIXGeneral, STIXGeneral-webfont, serif; font-style: italic; font-weight: 400; color: rgb(0, 0, 0);">y</span><span> is the income that the individual makes as a function of work hours</span></li><li  class = 'S3'><span style="font-family: STIXGeneral, STIXGeneral-webfont, serif; font-s